Protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein proteins http://ghr.nlm.nih.gov/handbook/howgeneswork/protein protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein protein survive and thrive http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein make up cells http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein http://ghr.nlm.nih.gov/handbook/howgeneswork/protein essential cellular functions What are proteins and what do they do? National Institutes of Health