Table 4.

Correlation between the presence of functional antibodies to the mAChR3 on TFK-cells and anti-M2 antibodies of the IgG- and IgM-type by ELISA.

Antibodies to			Number (percent) patients positive
mAChR3-TFK-1	M2 (IgG-type)	M2 (IgM-type)
Positive	Positive	Positive	16 (42)
Positive	Positive	Negative	11 (29)
Positive	Negative	Positive	5 (13)
Positive	Negative	Negative	2 (5)*
Negative	Positive	Positive	2 (5)
Negative	Positive	Negative	2 (5)

Parenthesis reflects % patients' sera showing none, stimulatory, or inhibitory anti-mAChR3 reactivity. All 36 anti-M2 positive sera reacted with the PDC-E2.

^*Of these two anti-M2 negative patients one had antibodies to nuclear dots (sp100) and one to gp210.