Optional Readonly cleavageNucleotide preference at cleavage site: A > U > C >> G
Optional Readonly distanceDistance range from poly-A signal to cleavage site [min, max]
Optional Readonly downstreamDSEPattern for downstream sequence elements (DSE)
Optional Readonly polyASignalPolyadenylation signals to search for, in order of preference
Optional Readonly upstreamUSEPattern for upstream sequence elements (USE)
Options for configuring polyadenylation site recognition.