DNA isn't end-to-end genes encoding proteins – in between the gene codes are non-coding regulatory elements , including some that play vital roles in when genes are 'read-off'. But identifying their unique codes among the permutations of 'ATGC' (letters representing the four DNA nucleotide bases) is a challenge because they may be sited quite a distance from the gene on which they act. Using a shrimp-like crustacean Parhyale hawaiensis as a model with a genome of similar size to ours, here researchers have developed a method combining bulk with single-nucleus sequencing to identify such cis-regulatory elements genome-wide
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