Immunogen sequence: AAGACPEEIF SALQYSGTEV PLQWLRSELP YVLEMVAELA GQQDPGLGAF SCQEARRAWL DRHGNLDEAV EECVRTRRRK VQELQSLGFG PEEGSLQALF QHGGDVSRAL TELQRQRLEP FRQRLWDSGP EPTPSWDGPD KQSLVRRLLA VYALPSWGRA ELALSLLQET PRNYELGDVV EAVRHSQDRA FLRRLLAQEC A. Lyn proto o