different patterns of the expression of mhc class ii ag on t cells , b cells , and monocytes during the course of immunization with protein or polysaccharide ag were observed : whereas protein ag induced a high frequency of hla-dp- and hla-dr-expressing cells early in the course of immunization , polysaccharide vaccines elicited low and protracted increases of hla-dp+ t cells .
C0017349
mhc class ii
C0019759
hla-dp