Evidently it was from an upper-level biology course, “Biology of Disease”, at UC San Diego:
No joke, a friend just sent me this slide from her upper-level biology course.
I'm speechless. Create your own caption. pic.twitter.com/4sS6AvdRV1
— Dylan Griswold (@DylanPGriswold) April 25, 2019
Here’s the professor’s explanation to the class: