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Expression pattern of key genes in follicular development. LWF, large white follicle; SYF, small yellow follicle; F8, the eighth largest follicle; F4, the fourth largest follicle; F1, the largest follicle. A represents the genes associated with sex hormone secretion; B represents the genes associated with yolk transport, cellular matrix, inflammatory factors, and heat stress; C includes transcriptionally regulated factors and chemokine factors.
