TRAP, also known as uteroferrin, is an iron containing, glycosylated, acid phosphatase. It is the most basic of the acid phosphatases and is the only form not inhibited by L(+)-tartrate. Along with the related protein ACP2, TRAP mediates the removal of mannose 6-phosphate residues from proteins targeted to lysosomes. TRAP is present in brain at low levels, but is expressed at a much higher level in liver.Synonyms: Acid phosphatase 5 tartrate resistant, TRAP5, TRAcP, Tartrate-resistant acid ATPase, Tartrate-resistant acid phosphatase type 5