Fig. 1.

Y RNA expression during early Xenopus laevis development. (A) Nucleotide sequences and predicted secondary structures of Xenopus laevis Y RNAs (xY3, xY4, xY5, and xYα RNA). Positions of nucleotide sequences complementary to antisense MOs are indicated by thin black lines, and boxes show positions of evolutionarily conserved domains for xY3 RNA. (B) Temporal expression patterns of the indicated xY RNAs during development. Total RNA was prepared from embryos of each of the indicated developmental stages, and the abundance of each xY RNA per embryo was determined by quantitative RT-PCR.