![](http://www.alamy.com/thumbs/6/4529E7EE-A60B-45D4-98B0-B95D0F7B1610/2JKFT4D.jpg)
Scanning electron micrograph of a human natural killer cell. Credit: NIAID
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Photo credit: © NIH-NIAID / IMAGE POINT FR / BSIP / Alamy / Afripics
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