Assertion: ink | /r/MadeOf | melanin
Facets:
Source sentences:
text: The ink contains many compounds, including melanin, enzymes, polysaccharides, catecholamines (hormones), metals like cadmium, lead, and copper, as well as amino acids, such as glutamate, taurine, alanine, leucine, and aspartic acid ( 1 , 2).