September 5, 2023 Marvin Hausman, M.D.

Exhibit 10.13

September 5, 2023

Xxxxxx Xxxxxxx, M.D.

000 Xxxx Xxxxx Xxxx

Chuluota, Florida 32766

Re: Termination of Consulting Agreement

Dear Xxxxxx:

This letter is to confirm our oral agreement to terminate, effective immediately, the Consulting Agreement dated July 1, 2022, between us. We agreed that the termination of the Consulting Agreement would be appropriate, in light of our company’s recent changes to executive management.

As we further agreed, all sums due and owing as of the date of this letter would be honored by us and that your company would continue to abide by the terms of Sections 4 and 5 of the Consulting Agreement.

If you are in agreement, please sign below and return a signed copy to me.

Thank you very much for your service to our company.

Sincerely,

/s/ Xxxx X. Xxxxxxxxxx

Xxxx X. Xxxxxxxxxx

Chief Executive Officer

AGREED:

/s/ Xxxxxx Xxxxxxx

Xxxxxx Xxxxxxx, M.D.