Helper T cells can only see their antigen if it is presented on an MHC II molecule.

辅助性T细胞只有在抗原被装载在MHC II类分子呈递时才能够识别它们。

It's possible that this is because helper T cells, which originate in the thymus, help B cells make antibodies to the acetylcholine receptor.

这可能是因为起源于胸腺的T细胞，帮助B细胞产生ACh受体抗体。