Definitions

1. noun

A protein that acts as a member of the TGF-beta superfamily and is involved in the regulation of cell growth and differentiation.

“Activin is a key regulator of reproductive functions in vertebrates.”

2. noun

A dimeric protein that consists of two alpha subunits (inhibin beta A and beta B) and is involved in the regulation of cell signaling pathways.

“The activin protein plays a crucial role in the development of embryonic cells.”