Immunogen sequence: PLRVQKIRAG RSTPGLRPQH LSGLEMIRDL CDGQLEGAEI GSTEITFTPE KIKGGIHTAD TKTAGSVCLL MQVSMPCV Highest antigen sequence identity to the following orthologs: Mouse - 94%, Rat - 95%. RTCD1 catalyzes the conversion of 3'-phosphate to a 2', 3'-cyc