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When referring to the coverage of a base in a reference genome, the number of reads covering that base in an alignment. When referring to the coverage of a genome in a sequencing experiment, the average number of times that a base was sequenced. = total number of sequenced bases / genome size. For example, a 100x coverage means that each base was sequenced on average 100 times. For the human genome, that would be ~ 300 Gigabases.

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