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Concentrations of the complement-derived chemoattractant C5a in milk of quarters infused with either MDP, S. aureus LTA, or LTA plus MDP from the time of infusion (time zero) to 96 hpi. Data are from six cows (median values and interquartile ranges). *, significantly increased concentration relative to that at time zero (P < 0.05); $, significant difference between LTA plus MDP and LTA or MDP alone (P < 0.05).
