Long-term debt consists of the following:

Future principal payments on long-term debt are $241,935 for 2012, $967,742 for each of 2013 and 2014, and $322,581 for 2015.

Loan and Security Agreements and Warrants

On September 30, 2011, the Company entered into the Loan and Security Agreement with MidCap Financial SBIC, LP (“MidCap”), as administrative agent, and the Lenders listed on Schedule 1 thereto (the “MidCap Loan”). The credit facility under the MidCap loan has a principal amount of $5.0 million and a term of 42 months, and is subject to prepayment penalties. Under the MidCap Loan, AxoGen is required to make interest only payments for the first 12 months, and payments of both interest and straight line amortization of principal for the remaining 30 months. The interest rate is 9.9% per annum, and interest is computed on the basis of a 360-day year and the actual number of days elapsed during which such interest accrues.

The agreement contains customary affirmative and negative covenants, including, without limitation, (i) covenants requiring AxoGen to comply with applicable laws, provide to MidCap copies of AxoGen’s financial statements, maintain appropriate levels of insurance, protect, defend and maintain the validity and enforceability of AxoGen’s material intellectual property, (ii) covenants restricting AxoGen’s ability to dispose of all or any part of its assets (subject to certain exceptions), engage in other lines of business, change its senior management, enter into merger or consolidation transactions, incur or assume additional indebtedness, or incur liens on its assets, and (iii) covenants requiring the Company to meet certain minimum Net Invoiced Revenue as defined in the agreement, or maintain a cash balance of 80% of the loan principal amount.

The MidCap Loan is secured by all of AxoGen’s assets. The lenders also received a ten-year warrant to purchase 89,686 shares of AxoGen’s common stock at $2.23 per share. The fair value of the warrant was $173,736 and was recorded as debt discount and is being amortized through interest expense using the effective interest method over the term of the debt. Amortization of debt discount was $12,207 for 2011. The Company also recorded $317,990 in deferred financing costs which is being amortized over the term of the loan. Amortization of the deferred financing cost was $22,714 for 2011.

On April 21, 2008, the Company entered into a Loan and Security Agreement with two different lenders, as subsequently amended (the “2008 Loan and Security Agreement”), which provided for a loan with an aggregate principal amount of $7.5 million. The loan’s maturity date was October 1, 2011. The loan bore interest at a rate of 18% per month, as amended, and was secured by all of the Company’s assets. Upon the execution of the 2008 Loan and Security Agreement, the Company recorded $155,556 in deferred financing costs which were being amortized through interest expense on the accompanying consolidated statements of operations over the life of the term note. Amortization of the deferred financing costs was $12,963 and $61,531 for 2011 and 2010, respectively.

In conjunction with the 2008 Loan and Security Agreement, the Company also issued warrants to purchase a combined 280,803 shares of the Company’s Series C Preferred Stock, immediately exercisable at $0.7345 per share, expiring on May 1, 2018. The fair value of the warrants was recorded as debt discount and was being amortized through interest expense using the effective interest method over the term of the debt. Amortization of this debt discount was $11,436 and $34,308 during 2011 and 2010, respectively.

During 2010, the Company executed six amendments to the 2008 Loan and Security Agreement, resulting in the issuance of a total of 28,561,272 additional warrants for the purchase of the Company’s Series D preferred stock, immediately exercisable at $0.1198 per share, expiring on varying dates during the year 2020. The total fair value of the warrants of $2,160,879 was recorded as deferred financing costs during 2010 and was being amortized through interest expense—deferred financing costs on the accompanying consolidated statement of operations. The Company recognized $990,792 and $1,170,087 in amortization of these costs for 2011 and 2010, respectively. See additional discussion related to the accounting for the warrants at Note 9.

On April 11, 2011, the Company entered into a waiver and seventh amendment (the “Amendment”) to the 2008 Loan and Security Agreement. The Amendment waived the event of default resulting from the failure to pay the balance due under the 2008 Loan and Security Agreement by March 31, 2011, increased the annual interest rate to 18% beginning April 1, 2011, and extended the maturity to the earlier of an acquisition event (including the Merger discussed in Note 4), or October 1, 2011. In connection with the Amendment, an event of default would occur if the Company fails to receive proceeds from equity and/or convertible subordinated debt financings of at least $2.5 million by May 31, 2011 and an additional $2.5 million by August 31, 2011.

On September 30, 2011, the Company paid the entire outstanding loan balance under the 2008 Loan and Security Agreement. The Company also paid a loan pay off fee of $109,436 which is included in the amortization of deferred financing costs for 2011. The warrants issued to the holders of the 2008 Loan and Security Agreement (see Note 9) expired upon the effective date of the Merger.

2009 Convertible Debt and Warrants

The 2009 Convertible Debt was initially convertible automatically into shares of conversion stock, defined in the agreement as a future “qualified next equity financing,” or its Series C preferred stock. The debt was also convertible at the option of the Company in the event of a future equity financing which was not considered a “qualified next equity financing”. The conversion price was defined as the per share purchase price of the applicable equity financing which results in the conversion of the debt, or $0.734 per share if converted into Series C preferred stock.

Upon issuance of the 2009 Convertible Debt, the Company recorded a total of $49,639 in debt issuance costs. These costs were included in deferred financing costs in the accompanying consolidated balance sheet and were being amortized through interest expense on the accompanying consolidated statements of operations over the debt term. Amortization of the debt issuance costs was $45,203 as a result of the conversion of the debt in full into Series D preferred stock during January 2010.

In conjunction with the issuance of the 2009 Convertible Debt, the Company also issued warrants, initially for the purchase of 4,368,948 shares of the Company’s Series C Preferred Stock, immediately exercisable at $0.7345 per share, expiring on August 31, 2014. The fair value of the warrants of $74,272 was recorded as debt discount and was being amortized through interest expense using the effective interest method over the term of the debt. This debt discount was expensed in full through interest expense in 2010 as a result of the conversion of the associated debt, as noted below. The lenders paid additional consideration totaling $5,234 for the purchase of the warrants. As a result of the Company’s subsequent issuance of its Series D preferred stock on January 7, 2010, the warrants became exercisable for the purchase of Series D preferred stock at $0.1198 per share. All other terms of the warrants remained unchanged. See additional discussion related to the accounting for the warrants at Note 9.

As a result of the Company’s closing on the sale of its Series D preferred stock on January 7, 2010, all of the $2,617,000 in principal under the 2009 Convertible Debt, along with $73,994 in accrued and unpaid interest, was converted into 22,462,387 shares of the Series D preferred stock at a rate of $0.1198 per share.

2010 Convertible Debt and Warrants

The 2010 Convertible Debt is convertible automatically into shares of conversion stock, defined in the agreement as a future “qualified next equity financing”, or its Series C preferred stock. The debt is also convertible at the option of the Company in the event of a future equity financing which is not considered a “qualified next equity financing”. The conversion price is 65% of the price per share paid at the next equity financing, as defined in the agreement.

Upon issuance of the 2010 Convertible Debt, the Company recorded a total of $122,900 in deferred financing costs which were being amortized through interest expense on the accompanying consolidated statements of operations over the debt term. Amortization of the deferred financing costs was $87,221 and $35,679 for 2011 and 2010, respectively.

In conjunction with the issuance of the 2010 Convertible Debt, the Company also issued warrants, for the purchase of shares of the Company. The warrants expired upon the effective date of the Merger.

In connection with the Merger on September 30, 2011, the 2010 convertible debt of $1,338,455 and $2,359,091 and accrued interest of $263,371 were converted into 2,581,963 shares of AxoGen, Inc. common stock using a conversion price of $0.0572 (65% of price per share paid at the next equity financing or $0.088) and the 0.03727336 exchange ratio.

2011 Convertible Debt

On May 3, 2011, the Company issued an 8% convertible note payable for $500,000 to LecTec related to the Merger. On May 31, 2011, the Company issued additional convertible notes payable under the same terms of which $2,000,000 was issued to LecTec and $500,000 was issued to certain AC shareholders. The notes were collateralized by all assets of the Company and subordinated to the Company’s 2008 Loan and Security Agreement. Principal and interest accrued under the note is due upon the earlier of June 30, 2013 or a change in control other than in connection with the Merger.

On August 29, 2011, the Company issued an additional subordinated secured convertible promissory note in the principal amount of $2,000,000 to LecTec and $500,000 to certain AC shareholders on the same terms as the $3,000,000 notes issued by the Company in May 2011.

The $4,500,000 notes to LecTec were retired after the closing of the Merger. The $1,000,000 notes to certain AC shareholders were converted into 423,709 shares of AxoGen, Inc.’s common stock using the $0.088 conversion price and the 0.03727336 exchange ratio.