MICROBIOTA-MEDIATED ELEVATION OF HOST 5-HT IS REVERSIBLE ★食★ E 1100 SPF GF PO P21 P42 Po P21 P42 SPFGF PO P21 P42 Po P21 P42 42 GF+CONV. SPF+ABX VEH GF+CONV."SPF+ABX ns c 0 SPF GF P0 P21. 42.P0. 21 P42 P42 SPF GF P0.21 P42 P0. 21 P421 42 GF+CONV PF+ABX EHMICROBIOTA-MEDIATED ELEVATION OF HOST 5-HT IS REVERSIBLE