
Keywords: Histidine (His); Isoleucine (Ile); Leucine (Leu); Phenylalanine (Phe); Valine (Val); Glycine (Gly); Proline (Pro); Tyrosine (Tyr); Serine (Ser); Compound specific isotope analyses; Amino acid δ13C fingerprinting; Bulk δ13C and δ15N analyses; Organicall