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Please can some one explain me the "negative" & "positive" Selection in T cell maturation ... Im really getting confused here!

Negative and positive selection of T-cells

please take a look at

http://www.bio.davidson.edu/courses/immu.../Main.html


http://www.youtube.com/embed/odLLr6mjaUQ

Thanx maryam2009
soooo truly appreciate

you are welcome

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