Immunogen sequence: DRDRTFLEGD WTSPSKSSDR RNSLEGYSRS VRSRSGERWG ADGDRGLPKP WEERRKRRSL SSDRGRTTHS PYEERSRTKG SGQQSERGSD RTPERSRKEN HSSEGTKESS SNSLSNSRHG AEERGHHHHH HEAADSSHGK KARDSERNHR TTEAEPKPLE EPKHETKKLK NLSEYAQTLQ L. May function in the regulation of