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647

Centuries: 6th century - 7th century - 8th century

Decades: 590s 600s 610s 620s 630s - 640s - 650s 660s 670s 680s 690s

Years: 642 643 644 645 646 - 647 - 648 649 650 651 652

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Gram-negative

... by Gram staining, in contrast to gram-positive bacteria. The difference lies in the cell wall of the two types; gram-positive bacteria have a high amount of ...