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Think of DNA as a cell blueprint

They are grouped purely as a research convenience so that researchers can study individual versus separate peptide activity, cross-pathway interactions and compatibility within multi-compound experimental systems

doi: 10.3389/fphar.2014.00280 Received 01 October 2014 Accepted 02 December 2014 Published 18 December 2014 Volume 5 - 2014 Edited by Dominique Massotte, Institut des Neurosciences Cellulaires et Intgratives, France Reviewed by Chris Bailey, University of Bath, UK

Much like hormones, peptides bind to specific receptors on cell membranes to trigger specific biological responses