A read displayed in the Reads Area consists of the bases (A, C, G, T). It may also contain the N character that stays for an ambigous base. Depending on the value of the Cigar parameter, the read can be shown partially or gaps can be inserted inside the read (see below).
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Or uncheck the Show pop-up hint check box on the Assembly Browser Settings tab of the Options Panel.
The hint shows the following information about the read:
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