MBP GI:68509932 myelin basic protein isoform 4 1 masqkrpsqr hgskylatas tmdharhgfl prhrdtgild sigrffggdr 50 51 gapkrgsgkd shhpartahy gslpqkshgr tqdenpvvhf fknivtprtp 100 101 ppsqgkgaeg qrpgfgyggr asdyksahkg fkgvdaqgtl skifklggrd 150 151 srsgspmarr