81.   The immune cells also secrete substances called cytokines that lead to inflammation, attracting more immune cells.

82.   The immune cells then make a substance called interferon-gamma, which acts as a signal to halt cell division.

83.   The low humidity creates gaps in the mucous fining of the respiratory tract, which holds key immune cells.

84.   The naturally occurring immune cells efficiently target infected cells but are quickly lost during the early stages of HIV infection, the company said.

85.   The naturally occurring HIV-targeting immune cells efficiently target infected cells but are quickly lost during the early stages of HIV infection, the company said.

86.   The process reinjects healthy immune cells removed from patients before the debilitating therapy begins.

87.   The researchers concluded that under stress, immune cells do not disappear.

88.   The protein stimulates immature immune cells, prompting the production of antibodies to the Hib sugars and protecting the child from infection.

89.   The quiescent virus can spring forth when the immune cells it infects are awakened to battle an ordinary infection.

90.   The skin cells were then immersed for an hour or two in a soup made of extracts of immune cells known as T cells.