The term protein is taken from the Greek word “Proteios” which means “first”. It is an organic compound which is present in all living cells. Proteins are composed of 15 to 25% nitrogen and about an equal amount of oxygen. In the form of enzymes, hormones, antibodies, and globulins, they catalyse, regulate, and protect the body chemistry. In the form of haemoglobin, myoglobin and various lipoproteins, they effect the transport of oxygen and other substances within an organism.
Journal of Proteins & Peptides, Protein & Peptide Letters, International Journal of Peptide and Protein Research, Protein and Peptide Letters, Trends in Peptide and Protein Sciences, Protein Peptide Interactions, Peptides, Elsevier, World Research Journal of Peptide and Protein, Journal of Peptide Science, European Peptide Society, Current Protein & Peptide Science, Peptide and Protein Delivery, ScienceDirect.