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Yolk protein (YP) or vitellogenin (Vg), the main component of yolk, is the key nutrient for embryonic development. YPs, encoded from uncleaved genes existing mainly in cyclorraphan flies, are different from VGs that are present in most non-cyclorraphan dipterans and other insects. In this study, cDNAs of two YPs, namely Bdyp1 and Bdyp2 (GenBank accession Nos. AF368053 and AF368054), were isolated...