CTLA4 GI:83700231 cytotoxic T-lymphocyte-associated protein 4 isoform b precursor 1 maclgfqrhk aqlnlatrtw pctllffllf ipvfckamhv aqpavvlass 50 51 rgiasfvcey aspgkatevr vtvlrqadsq vtevcaatym mgneltfldd 100 101 sictgtssgn qvnltiqglr amdtglyick velmypppyy lgigngtqiy 150 151 viakekkpsy nrglcenapn rarm