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Immune system defends the human body from external attacks. Digital illustration.

Stock Photo:
Image ID: 93256651
Copyright:
Small
500x375 6.9"x5.2" (72dpi) 160 KB
Med
1000x750 3.3"x2.5" (300dpi) 486 KB
Large
3000x2250 10.0"x7.5" (300dpi) 1.9 MB
Super
6000x4500 20.0"x15.0" (300dpi) approx.4.6 MB
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