Complete the analogy:

Ectoderm: Somatotropin : : Endoderm:

Somatotropin also called as growth hormone or protein hormones which are secreted in the anterior pituitary glands. The endocrine glands that arise from ectoderm produce protein hormones. Hence, Somatotropin is derived from ectoderm and thyroxine from endoderm. Epinephrine, cortisol and estrogen all are derived from the ectoderm.