1. INTRODUCTION
The caseins of milk form a unique calcium-phosphate
transport complex in the mammary gland. These colloidal
complexes sequester calcium in the Golgi apparatus
and, as secreted, are the chief source of calcium for the
mammalian neonate. At the heart of the interactions which
lead to casein micelle formation, is the binding of Ca21
to the phosphorylated caseins as1-, b-, and as2-caseins