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Design of the yeast exposure study. The alterations in the intestinal bacterial communities of conventionally raised (CR) and germ-free (GF) zebrafish larvae were examined after exposing them to the yeasts Debaryomyces sp. or Pseudozyma sp. for 24 h. The larvae in the control group were exposed to PBS. The intestine samples were collected on day 14 and water samples from their respective flasks/tanks were collected at days 2, 3, 7, and 14.
