Natural Killer cell

I kill bad cells without being told, a vigilante

[Natural Killer cell @NK_cell]

Oh, we won�t forget, and we�re ready! http://www.blobs.org/science/cells/defence2.gif

[Natural Killer cell @NK_cell]

@_fibroblast: You want to kill us all?

[Natural Killer cell @NK_cell]

@_fibroblast: You know your duty. Do it!

[Natural Killer cell @NK_cell]

@HLA_MHC: but, @_fibroblast doesn�t feel well!

[Natural Killer cell @NK_cell]

@_fibroblast: You say you don�t feel so well?