Immunogen sequence: NIYSPKETIP EEARSDMHYS VAEGLKPAAP SARNAPYFPC DKASKEEERP SSEDEIALHF EPPNAPLNRK GLVSPQSPQK SDCQPNSPTE SCSSKNACIL QASGSPPAKS PTDPKACNWK KYKFIVLNS. Bcl-6 proto-oncogene product (a Kruppel-type zinc-finger protein) is mainly expressed in no