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Jrk
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<p><i>dClock (clk)</i> is a gene located on the 3L <a href="/facts/Chromosome/FRGf11FC">chromosome</a> of <i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i>. <a href="/facts/Gene_mapping/QnC0Vvjx">Mapping</a> and <a href="/facts/Molecular_cloning/Te56373e">cloning</a> of the gene indicates that it is the <i>Drosophila</i> <a href="/facts/Homology_(biology)/muctKlyT">homolog</a> of the mouse gene <a href="/facts/CLOCK/lhutPKq1">CLOCK</a> (<i>mClock</i>). The Jrk mutation disrupts the <a href="/facts/Transcription_(biology)/bDgp9HDN">transcription</a> cycling of <i><a href="/facts/Period_(gene)/tgrEhfJC">per</a></i> and <i><a href="/facts/Timeless_(gene)/ofpM5F13">tim</a></i> and manifests dominant effects. </p>