Objective To observe the dynamic changes of oral microflora early colonized in infants.

目的观察婴儿口腔早期定植细菌的动态变化。

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However, if germ free animals were colonized early in life, these effects could be reversed.

FORBES: Thinking With Your Gut. Literally.

So maybe Arabia was colonized early and there was a long pause before the Beachcomber Express set off for southeast Asia?

WSJ: Matt Ridley on Early Humans Leaving Africa | Mind & Matter