Immunogen sequence: KRVSINKDELK STSKAVETVH NLCCNENKGA SELVAELSTL YQCIRFPVVA MGVLKWVDWT VSEPRYFQLQ TDHTPVHLAL LDEISTCH Highest antigen sequence identity to the following orthologs - mouse 98%, rat 64%. The NELF complex of proteins interacts with the DSIF