Beeduh, proteins in products may say just that, silk protein for instance. Some may leave off "protein" and just say what they are, like Keratin or Collagen. They can also be hydrolyzed, which means the protein has been broken into pieces, such as hydrolyzed wheat protein. They can also appear as amino acids, the building blocks of proteins, like silk amino acids.

You might want to check out Ingredients Commonly Found in Hair Care Products. It's a good reference for what's what in a product.
CG since 11/2011
2c /3a F /Mii, low porosity

Winter Products /Routine:
Clarifying: ACV rinses, Suave Professional Men Deep Clean Peppermint
Low Poo: Renpure Luxurious Argan Oil
Co-washes: VO5 Kiwi Lime Squeeze or Strawberries & Cream
RO: VO5 KLS or S&C, Cure Care
LI (if needed): VO5 S&C, VO5 KLS, Cure Care
Stylers: FSG, L'Oreal Studio Clean gel, Tresemme Flawless Curls Bouncy Curls gel
PT: IAGirl's as needed
Trying: Tresemme Expert Selection Perfectly (Un)Done Conditioner