Ready-to-use ELISA kits are available for the detection of queuine tRNA-ribosyltransferase 1, an alias of the protein, queuine tRNA-ribosyltransferase catalytic subunit 1. The official gene symbol is QTRT1. The protein, with a mass of 44 kDa and length of 403 residues, is reported to be cytoplasmic and mitochondrial. It is a member of the Queuine tRNA-ribosyltransferase family and may be known by other names, including: TGT, FP3235, queuine tRNA-ribosyltransferase 1, guanine insertion enzyme, TGT catalytic subunit, and TGT 43-KD subunit.