The progesterone concentration in serum-free medium from primary bovine granulosa cells was measured after 48 h of treatment using ELISA assays [37]. The limit of detection for progesterone was 12 pg/tube. The intra- and inter-assay coefficients of variation for progesterone were less than 10% and 11%, respectively. The results were expressed as the concentration of progesterone (ng/mL) per mg of protein per well. Data were obtained from three independent cultures, and each treatment (recombinant human CCL21: 10, 50, 100, 200 ng/mL) had four replicates.
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