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Expression of mRNA of (A) apelin and (B) APJ in granulosa cells (GC) in follicles of different stages of follicle development and maturation. Results are presented by 40 minus mean of crossing points (cp) ± SEM (n=7-12). Classification of follicles occurred by follicle size and oestradiol-17β concentration in the FF (<0.5 ng/ml, 0.5-5 ng/ml; 5-40 ng/ml; 40-180 ng/ml; >180 ng/ml).
