Levothyroxine, the major hormone derived from the thyroid gland, is the agonist of Thyroid hormone receptor alpha and beta.evothyroxine (L-T(4))can upregulate the expression of P-gp mRNA and protein in LS180 cells, but only L-T(4) and L-T(3) can produce the same effect in Caco-2 cells, which are relatively lacking in PXR.

IGF-I (30-41) is amino acids 30 to 41 fragment of Insulin-like Growth Factor I (IGF-I).

DALDA is a potent and highly selective μ-opioid receptor agonist with a Ki of 1.69 nM. DALDA shows antinociceptive and respiratory effects.