Been wondering the same thing about a professor I had kinesiology and biomechanics from. I have a good relationship with my exercise physiology professor (crosslisted at a zoology course, so should count for basic) and my anatomy professor, but since I need 2 science professors, and I would prefer to use my anatomy professor to write a letter that is directed at my 500+ hours as an unpaid anatomy tutor working in the open anatomy labs, I would love to use my kinesiology professor as a second science, if it would be accepted. I know RVU will take the kinesiology as a science, but like you said places like PCOM seem to be strict.