Exhibit 4.2

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

Pursuant to our Articles of Incorporation, our authorized capital stock consists of 100,000,000 shares of common stock, par value $0.001 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share.

The following description summarizes the material terms of our capital stock and does not purport to be complete. It is subject to, and qualified in its entirety by reference to, our Articles of Incorporation and our Bylaws, each of which is incorporated by reference as an exhibit to our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “Report”) of which this Exhibit 4.2 is a part.

Defined terms used herein but not otherwise defined shall have the meaning ascribed to such terms in the Company’s Report.

Common Stock

Our common stock is listed on the Nasdaq Capital Market under the symbol “MAMO.”

Each share of our common stock is entitled to equal dividends and distributions per share with respect to the common stock when, as and if declared by our Board of Directors. No holder of any shares of our common stock has a preemptive right to subscribe for any of our securities, nor are any shares of our common stock subject to redemption or convertible into other securities. Upon liquidation, dissolution or winding-up of our company, and after payment to our creditors and preferred stockholders, if any, our assets will be divided pro rata on a share-for-share basis among the holders of our common stock. Each share of our common stock is entitled to one vote on all stockholder matters. Shares of our common stock do not possess any cumulative voting rights.

The presence of the persons entitled to vote a majority of the outstanding voting shares on a matter before the stockholders constitute the quorum necessary for the consideration of the matter at a stockholders’ meeting.

Except as otherwise required by law, the Articles of Incorporation, or any certificate of designations, (i) at all meetings of stockholders for the election of directors, a plurality of votes cast are sufficient to elect such directors; (ii) any other action taken by stockholders are valid and binding upon us if the number of votes cast in favor of the action exceeds the number of votes cast in opposition to the action, at a meeting at which a quorum is present, except that adoption, amendment or repeal of the Bylaws by stockholders requires the vote of a majority of the shares entitled to vote; and (iii) broker non-votes and abstentions are considered for purposes of establishing a quorum but not considered as votes cast for or against a proposal or director nominee. Each stockholder has one vote for every share of stock having voting rights registered in his or her name, except as otherwise provided in any preferred stock designation setting forth the right of preferred stock stockholders.

The common stock does not have cumulative voting rights, which means that the holders of 51% of the common stock voting for election of directors can elect 100% of our directors if they choose to do so.