Thyroid hormones, T4 and TSH, diffuse across the placenta traveling from the mother to fetus for 10-12 weeks before the fetus’s own thyroid gland can begin synthesizing its own thyroid hormones.
TSH |
Delange also performed research for neonatal screening for congenital hypothyroidism, using TSH levels as a marker for hypothyroidism.
The β (beta) subunit (TSHB) is unique to TSH, and therefore determines its receptor specificity.