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drosophila melanogaster
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during fertilization, the drosophila egg contains two localized mrnas. one, the bicoid mrna, is located at the anterior pole, and the other, the oskar mrna, is located at the posterior pole. the oskar mrna encodes an rna-binding protein that is responsible for the assembly of polar granules. the polar granules control the development of tissues that arise from posterior regions of the early embryo,including the abdomen and the pole cells, which are the precursors of the germ cells.
semasa dan selepas persenyawaan, telur drosophila mengandungi dua jenis mrna, iaitu mrna bicoid pada kawasan anterior, dan mrna oskar pada kawasan posterior. mrna oskar mengodkan protein pengikatan rna yang bertanggungjawab untuk perhimpunan granul kutub. granul kutub mengawal perkembangan tisu kawasan posterior semasa fasa awal embrio, termasuk abdomen dan sel pole, yang merupakan prekursor sel-sel germa.