Immunogen sequence: RAKFRRNERA MLASRSASLL KSYSQEAAIE QPVAPRPTAL SPDYLSWTAS SPYSTVPPYS PGSSGPATPG VNMANSIASL RLKAKEFSLH HSQVPTVN. The paired-class homeobox genes PRX1 and PRX2 are necessary for craniofacial and limb development and are expressed in simila