White blood cells traveling in and out

Can a cell leave a body then come back?
I'm referring to Osmosis Jones, if you've seen the movie. If not, can you answer my question anyhow.
Please be serious about this, i don't need smarty pants with stupid answers. Thanks

I haven't seen the movie, and your question is a little vague. I'm assuming that when you speak of a cell leaving the body, I take that to me that the cell has been removed from the organism and is cultured or manipulated in some fashion and then returned to the original organism. As long as the cell surface membrane molecules have not be altered or contaminated in some way, the host immune system will recognize that cell as part of the self. If the cell has been altered in some fashion, the host immune system will detect that change and attack the cell as if it was a foreign body. So, in that sense a cell can be extracted and then returned to the original host.

Then again, your question may be referring to something else entirely. My alternative answer would be the thymus gland or bone marrow.

See: Thymoma (Cancer of the Thymus)
http://www.fccc.edu/cancer/types/lung/th…


Best regards.
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