That conclusion was based upon two principles. FDA accepted the fact that the manufacturing process for Monsanto's version of rbGH did not produce an exact duplicate of the naturally occurring bGH, citing a study in which the N-terminus of rbGH was incorrectly transcribed as methionine. The bovine growth hormone and its genetically engineered version both contain 191 amino acids. Human growth hormone also contains 191 amino acids. Science has ignored a general principle and universal wisdom applied to all mammals.
Milk is a hormonal delivery system.
Mechanisms in milk insure that lactoferrins, immunoglobulins, and protein hormones do indeed survive digestive processes, and exert biological effects. P.P. Groenewegen, B.W. McBride, J.H. Burton, T.H. Elasser. Equivalent Potency and Pharmacokinetics of Recombinant Human Growth Hormones with or without an N-Terminal Methionine. Endocrinology 122. 1998, pp.2920. B.N. Violand, et al.