we have investigated the role of thyroxine in the development of the ipsilateral retinothalamic projection by studying retinal projections and patterns of retinal histogenesis in tadpoles whose ability to produce thyroxine was blocked by treatment with propylthiouracil ( ptu ) , and in similar tadpoles in which thyroxine was restored by injection of small amounts of thyroxine into one eye .
C0035298
retinal
C0015392
eye