1. H. A. Tucker, “Lactation,” Vol. 1, ed. by B. L. Larson and V. R. Smith, Academic Press, New York and London, 1974, p. 277.
2. R. Maniatis, E. F. Fritsch and J. Sambrook, “Molecular Cloning—A Laboratory Manual,” Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y., 1982, pp. 212 ~ 246.