K-Casein Oligosaccharide Hydrophilic Hydrophobic and almost no PO4 k-Casein Hairs (non calicum binding) Casein Micell 99 κ - Casein Hydrophilic and almost no PO4 -- Hydrophobic Oligosaccharide k - Casein Hairs (non calicum binding) ++ Casein Micell