Interesting - I was told to use protein now and then, but it wasn't so specific. I wish it was!
Anyway, this is what I know about proteins (and it might not be all-encompassing):
if it says "hydrolyzed" it's probably a protein
if it says "amino acid" it's probably a protein
if it says "keratin" it's probably a protein.
HTH! Hopefully someone else will be able to tell you more.
2b (with some straight under-layer, grrrrr)
Normal porosity, low elasticity, medium texture
(according to CurlGenie - HUGE surprise, I always thought I had fine hair and my stylists always agreed)
Tried CG for a summer, but it wasn't for me. I don't load up on sulfates and silicones, but I have no shame in using them when I want/need to! Currently loving LOOB.