METHODS

get_ids_for_special_symbols()

Gets state-to-id mapping for missing and gap symbols

 Type    : Accessor
 Title   : get_ids_for_special_symbols
 Usage   : my %ids = %{ $obj->get_ids_for_special_symbols };
 Function: Returns state-to-id mapping
 Returns : An empty hash reference
 Args    : None
 Notes   : This method is here as an override
           because restriction site data has
           no missing or gap symbols, just
           presence/absence