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Relative quantification of mRNA expression of immune-related proteins in CAM of embryonated chicken eggs challenged with C. psittaci (gray bars) and C. abortus (black bars) compared to mock infection. Means are significantly different (P ≤ 0.05). a, C. psittaci versus mock; b, C. abortus versus mock; c, C. psittaci versus C. abortus.
