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Represents a reusable collection of biological features for auto-annotating nucleotide and AA sequences. FeatureLibraries enable users to define common sequence motifs (such as genes, promoters, terminators, or protein domains) with associated patterns, then automatically detect and annotate those features across many sequences. Each library contains FeatureLibraryItems that specify the pattern to match and the annotation details to apply. Libraries can be shared with collaborators through ownership and permission controls, making them useful for standardizing annotation practices across a team. When running auto-annotate on a sequence, users select which libraries to search against.