Centuries: 5th century - 6th century - 7th century
Decades: 500s 510s 520s 530s 540s - 550s - 560s 570s 580s 590s 600s
Years: 550 551 552 553 554 555 556 557 558 559 560
... of red blood cells, taken from the site http://www.cc.nih.gov/ccc/ccnews/nov99/ of the NIH, a US government agency. The photos are attributed to Drs. Noguchi, Rodgers, and ...
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