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…showed last 75 words of 337 total…helps promotes growth of beneficial organism named Lactobacillus bifidus. Immune cells are also abundant in human milk. They consist of white blood cells that fight infection themselves and activate other defense mechanisms. The second most common milk leukocyte is the macrophage. The macrophages in breast milk manufacture lysozyme. Lysozyme is an enzyme that destroys bacteria by disrupting their cell walls. Breast milk is truly a fascinating fluid that supplies infants with far more than nutrition.