Other monocytes differentiate into dendritic cells, the prototypical antigen presenting cell, which roam around in the lymph, blood, and tissue.

其他单核细胞会分化成树突状细胞，是典型的抗原呈递细胞；它们会在淋巴、血液和组织中游走。

Like other antigen presenting cells, the B cell will load the antigen onto an MHC molecule called MHC II, and display it to T cells.

和其他抗原呈递细胞一样，B细胞将会把抗原装载在称为MHC II类分子的MHC分子上然后展示给T细胞。

So the antigen presenting cell will load the antigen onto an MHC molecule and display it to T cells - and when the right T cell comes along - it binds!

所以抗原呈递细胞会把抗原装载在MHC分子上以向T细胞展示当正确的T细胞出现时，它们就会结合！

When a B cell binds to an antigen that's on the surface of a pathogen, it is capable of phagocytosis and antigen presentation - so technically, they're also antigen presenting cells as well.

当B细胞和病原体表面的抗原结合以后，它就能够吞噬并呈递抗原；所以实际上，它们也是抗原呈递细胞。

A naive T cell can be activated or primed to allow it to turn into a mature T cell by any of the antigen presenting cells, but most often it's done by a dendritic cell.

一个初始T细胞可以被激活或活化，让它能转变为一个成熟T细胞；这可以通过任意抗原呈递细胞来实现，但通常是通过树突状细胞完成的。