Immunogen sequence: FEYLCQLEKAL PTPQAQQLQD VLSWMQPGVS ITSSLAWRQY GVDMGWLLPE CSVTDSVNLA EPMEQNPPQQ QRL Highest antigen sequence identity to the following orthologs - mouse 66%, rat 61%. TRF1 is a negative regulator of telomere length maintenance. Recently