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Follicle theca externa layer gene expression related to gonadotropin action and estradiol production in the hypothalamo-pituitary-gonadal (HPG) axis comparing the expression of hens samples outside (basal) and inside (surge) of the preovulatory surge (PS). Normalized data are presented relative to basal expression of the F1 follicle for each gene. Significance is denoted with an asterisk.
