We describe a Drosophila melanogaster cDNA clone encoding an amino acid (aa) sequence 75% identical to human ribosomal protein S4 (RPS4). The D. melanogaster RPS4 has 260 aa, if the NH2-terminal methionine is removed after translation of the mRNA. The mRNA for the protein is about 1 kb in length and is detected throughout the developmental stages tested (i.e., embryo, larva, pupa and adult). The cDNA clone hybridizes to two sites on the X chromosome, 1B1-2 and 3A3-6.
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