- Evidence, from family studies, for linkage disequilibrium between TGFA and a gene for nonsyndromic cleft lip with or without cleft palate. Feng, H., Sassani, R., Bartlett, S.P., Lee, A., Hecht, J.T., Malcolm, S., Winter, R.M., Vintiner, G.M., Buetow, K.H., Gasser, D.L. Am. J. Hum. Genet. (1994)