Proteins are necessary to sustain life, repair body tissues and promote cell renewal, to manufacture hormones, enzymes and blood cells. It is one of the most plentiful substances in the body second only to water, totaling approximately one fifth of a person body weight.
https://en.wikipedia.org/wiki/Protein
Uni
https://www.uniprot.org/
Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Protein
Resource
http://www.vrg.org/nutrition/protein.htm
Light
http://www.cookinglight.com/food/vegetarian/protein-for-vegetarians
Source
http://greatist.com/health/unexpected-sources-protein
Tube
https://www.youtube.com/results?search_query=Veg+Proteins