World 4 · Lock and Key: Receptors · 13 min · PRO
Molecules that fit
Receptors and binding
PRO · Medicine Lab
World 4: Lock and Key: Receptors is part of PRO
The first world of Medicine Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly