Video Link: https://www.youtube.com/watch?v=Br_cUAKbAl8

Apoptosis (cell suicide) is such an important decision to the cell, it uses a rheostat to control the decision instead of a simple ON-OFF switch. The mechanism involves multidomain BCL2 family proteins like Mcl-1 rendered here, and pro-death proteins like Bim.

Here is the original post:
A biochemical rheostat controls cell death using protein-protein interaction Bim Mcl1