although casein kinase activity is not associated with the endoplasmic reticulum , it remains to be proven whether it is truly a golgi enzyme , since analysis of subcellular membrane components fractionated by sucrose gradient centrifugation shows that the particulate protein kinase activity of the lactating mammary gland does not cosediment with galactosyl transferase , possibly a reflection of the heterogeneous nature of mammary gland golgi apparatus .
C0006141
mammary
C0929301
mammary gland