Ukai M, Mitsuma T
Experientia. 1978 Aug 15;34(8):1095-6. doi: 10.1007/BF01915370.
Plasma T3, T4 and TSH levels in developing germfree rats were high, low and normal as compared with those in conventional counterparts. The high T3/T4 ratio in germfree rat plasma was lowered by cholestyramine feeding.