Title: Polymorphism of bovine beta-casein and its potential effect on human health.
Author(s): Kaminski, Stanislaw, Cieslinska, Anna, Kostyra, Elzbieta
Source: J Appl Genet Volume: 48 Issue: 3 Pages: 189-98 Published: 2007
Abstract: (relevant excerpt) In addition, neurological disorders, such as autism and schizophrenia, seem to be associated with milk consumption and a higher level of BCM-7.
This site also has news articles about the A1, A2 and BCM-7 proteins.
http://www.enzymestuff.com/rtcowmilktypes.htm