- Low phosphoinositide-specific phospholipase C activity and expression of phospholipase C beta1 protein in the prefrontal cortex of teenage suicide subjects. Pandey, G.N., Dwivedi, Y., Pandey, S.C., Teas, S.S., Conley, R.R., Roberts, R.C., Tamminga, C.A. The American journal of psychiatry. (1999)