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Temporal expression dynamics of NvClock, NvTimeout, NvCry1a and NvCry1b genes by whole mount in situ hybridization. The stages for each gene represent embryos 24 - (a, f, k, p), 48- (b, g, l, q) 96- (c, h, m, r), 144- (d, i, n, s) and 168- (e, j, o, t) hours post-fertilization.
