TABLE 1.

Characterization of MSG-specific MAbs and frequency of epitope expression

MAb	Immunogena	Reactivityb			No. of positive plaques
		P. carinii f. sp. carinii MSG	P. carinii f. sp. hominis MSG	MBPMSG41–1065
RA-F1	Rat MSG	+	+	+	738
RB-E3	Rat Pc	+	−	+	286
RA-C6	Rat MSG	+	−	−	46
RB-C8	Rat Pc	+	+	−	112
RB-2F9	Rat Pc	+	+	−	307
HB-G6	Human Pc	+	+	−	3
RA-C7	Rat MSG	+	−	−	23
RA-C1	Rat MSG	+	−	−	55
RA-C11	Rat MSG	+	−	−	6
RB-F8	Rat Pc	+	−	−	7
RA-G10	Rat MSG	+	+	+	NDc
RA-E7	Rat MSG	+	+	+	ND

^aRat MSG, P. carinii f. sp. carinii MSG purified by electroelution from an SDS-polyacrylamide gel; Rat Pc, SDS-solubilized P. carinii f. sp. carinii; Human Pc, SDS-solubilized P. carinii f. sp. hominis. 

^bDetermined by immunoblotting reactivity. 

^cND, not done.