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Relative expression levels of selected candidate reference genes in the in vitro produced rabbit embryos. The expression level at the oocyte stage was taken as a reference to calculate the relative levels of the other stages. Stages with different letters are significantly (P ≤ 0.05) different for the levels of the gene. An asterisk (*) indicates significant differences {(* = P ≤ 0.05) and (** = P ≤ 0.01)} with the in vivo levels of the same stage.
