compound specific nitrogen from sperm whale skin tissue Ruiz-Cooley, PK Koch, MD McCarthy, et al (UCSC) version: 2016-08-02 This data resulted in Ruiz-Cooley et al (2014) PLoSONE Average Trophic Amino Acids: alanine, glutamate + glutamine, isoleucine, leucine, proline Average Source Amino Acids: glycine, lysine, phenylalanine, tyrosine