71.   Stem cells are believed to give rise to the wide variety of immune cells and oxygen-carrying red cells in the blood.

72.   Stressful experiences cause immune cells to act differently.

73.   Studies in several laboratories have shown that when deprived of vitamin A, T cells and B cells -- two type of immune cells -- fail to function properly.

74.   T-cells are immune cells that the AIDS virus destroys.

75.   The billions of immune cells were extracted from a baboon at the University of Pittsburgh, then frozen and flown to San Francisco.

76.   The enzyme, similar to one found in mammalian immune cells, converts hydrogen peroxide and chloride ions into hypochlorous acid, a basic ingredient of bleach.

77.   The drug does not work when taken alone, but can reduce levels of the AIDS virus and boost immune cells when taken with AZT.

78.   The gene produces a hormone that stimulates the production of immune cells.

79.   The immune cells, called dendritic cells, were fused with the tumor cells by passing an electric current through them.

80.   The GM-CSF, known as a cytokine, helped immune cells recognize cancer cells as foreign.