Question: What is the other name for a subastance , when bound to various radionuclides, is used in the treatment and diagnosis of certain types of cancer, and  is one of the 20 standard amino acids that are used by cells to synthesize proteins?
Sentence (from "Amino acid"): In the form of proteins, amino acid residues form the second-largest component (water is the largest) of human muscles and other tissues.
Relevant evidence: No