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539

Centuries: 5th century - 6th century - 7th century

Decades: 480s - 490s - 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s

Years: 534 535 536 537 538 539 540 541 542 543 544


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Blood

... and contains various components of the immune system defending the body against infection. Hormones also travel in the blood. Adult humans have roughly 60 ...