MPS5101 S1 2026 PA MPS5101 2026 年第一季 PA Check Your Learning How drugs act at their targets (Week 6) 检查你的学习——药物如何作用于其靶点（第6周）

An agonist is a ligand that binds to, and provokes a signal from a receptor via conformational changes in the excited state.激动剂 是一种配体，通过激发态构象变化与受体结合并引发信号。