_seq is not a method. It's a string, used as a hash key. The hash field appears to hold one of the object's attributes: The sequences keyed by name. The code you posted appears to be a check to see if two sequences have the same name.

In reply to Re: [BioPerl] a warning I do not understand omits a sequence by ikegami
in thread [BioPerl] a warning I do not understand omits a sequence by Anonymous Monk

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