Cytochalasin B is a mycotoxin binding to the barbed end of actin filaments. It can disrupt the formation of actin polymers (Kd: 1.4-2.2 nM for F-actin).
Chaetoglobosin A, the active compound extracted of Penicillium aquamarinium, is a member of the cytochalasan family. It preferentially induces apoptosis.