Immunogen sequence: LAPEPRYAHI PVRIKEQVVG LLAWNNCSCE SSGGGLPLPF QKQVRAIDLT KAFDPAELRA ASATREQEFQ AFLSRSQSPA DQLLIAPANS PLQYPLQGVE VQPLRSILVP GLSLQAASGQ E Highest antigen sequence identity to the following orthologs: Mouse - 86%, Rat - 84%. GM2 and GD2 ga