MacGregor, John ♂
Education
M.D. 6.5.1845 by examination.
Birth/childhood
From Edinburgh at graduation.
Career
Two medical students at Edinburgh University might fit - one from Edinburgh is a student 1839-1840 and the other from Renfrewshire is a student 1843-1844.
Possibly John [MacGregor, United College] 1832-1833 above.