And this follicular cell is responsible for synthesizing and releasing T three and T four hormones. Now, both T three and T four are produced using our tyrosine amino acid. T three simply means we have three eyed ions, three eyed atoms. Nt four means we have four eyed atoms attached onto that particular hormone. Now, T three and T four are both lipid soluble. So that means they do not dissolve in water, so they do not dissolve in our blood and they require protein carriers to basically carry them within our bloodstream.