The major, more potent form of thyroid hormone that interacts with target cells is 23:12 Biology The major, more potent form of thyroid hormone that interacts with target cells is a. tetraiodothyronine (T4). b. triiodothyronine (T3). c. thyroglobulin. d. thyroxinebinding globulin. e. tyrosine. Answer: b Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+