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

Spring Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
Co-washes: Suave Naturals Tropical Coconut or Daily Clarifying
Tresemme Expert Selection Perfectly (un)Done, Cure Care, Suave Tropical Coconut or Daily Clarifying
LI (if needed):V05 Kiwi Lime Squeeze, V05 Strawbery
Renpure Brazilian Keratin Straightening (old formula), Cure Care
Stylers: LALSG
PT: IAGirl's as needed