has subject area Adenylyl Cyclases Animals Biological Assay Caseins Cattle Cell Line Cells, Cultured Cryopreservation Cyclic AMP Epidermal Growth Factor Female Kinetics Lactation Lactoferrin Mammary Glands, Animal Osteoblasts Parathyroid Hormone Parathyroid Hormone-Related Protein Prolactin Proteins Time Factors