L-arginyl-[protein] + NAD(+) = H(+) + N(omega)-(ADP-D-ribosyl)-L-arginyl-[protein] + nicotinamide Experimental confirmation may be lacking for some isoforms. Testis specific. O-glycosylated with core 1 or possibly core 8 glycans. Belongs to the Arg-specific ADP-ribosyltransferase family.