1919
2 . A stable isotope - labelled ( SIL ) peptide of a unique peptide spanning residues 54 - 69 in exon 1 of the human UGT1A1 protein with the sequence RIYLSADPALVVIEHG was synthesized .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None