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.