Man pages matching name bio::seqfeature::gene::exon in section 3pm:

Bio::SeqFeature::Gene::Exon.3pm.en	debian 10 / libbio-perl-perl
Bio::SeqFeature::Gene::Exon.3pm.en	debian 11 / libbio-perl-perl
Bio::SeqFeature::Gene::Exon.3pm.en	debian 12 / libbio-perl-perl