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A human homologue of the rodent T cell mono ADPribosyl transferase RT6 mRNA was identified by a systematic analysis of human testis transcripts. This messenger encodes for a precursor protein of 367 aa (MW: 41.5 kDa) which exhibits a peptide signal, consensus domains for mono ADP-ribosyl transferase and a C-terminal part characteristic of glycophosphatidyl inositol anchored protein. This mRNA, transcribed from a gene localized in 4q13-q21, is not expressed in white blood cells but is specific for human testis in which it is likely to correspond to a new ADP-ribosyl transferase.

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