anchor.diff:          |> Seq.writeOrAppend path
           printfn "Writing is finished! Path: %s" path
   
  -
  +    ///if a FastA sequence is included this function searches the features corresponding sequence
       let getSequence (gFFFile : seq<GFFLine<#seq<'a>>>) (cDSfeature:GFFEntry)= 
       
   //        let firstCDS = 
  
positive.code: 
          sequenceOfFirstCDS
  
      //Output: Nucleotides.Nucleotides [] (ATG...TAA)
negative.code: //                |> Seq.filter (fun x -> x.Feature = "CDS")
  //
  //            filteredCDSFeatures |> Seq.head
          
          let sequenceOfLandmark = 
              let fastaItems = 
                  gFFFile 
  