however , the ganglioside gq1b in which the sequence ends with two sialic acids in a neuac alpha 2,8neuac linkage instead of a single sialic acid as in gd1a and gt1b , was effective as a receptor at a concentration 1/100th that of any of the other gangliosides tested .
C0037025
sialic acids
C0067762
sialic acid