Sialylated glycan chain termini and expression of ST3Gal-I, -II, -III, and -IV sialyltransferase RNA.

(A) ST3Gal sialyltransferases add sialic acid to the terminus of type I, II, or III glycan chains, as occurs in formation of selectin ligands such as sialyl Lewis X. (B) Total RNA from various mouse tissues was hybridized with cDNA probes specific for each of the sialyltransferases. The sybergreen-stained gel (bottom) indicates similar loading of the RNA.