- Pituitary tumors arising from glycoprotein hormone alpha-subunit-deficient mice contain transcription factors and receptors present in thyrotropes. Sarapura, V.D., Wood, W.M., Woodmansee, W.W., Haakinson, D.J., Dowding, J.M., Gordon, D.F., Ridgway, E.C. Pituitary (2006)