code: def make_fasta_url(
          ensembl_release,
          species,
          sequence_type,
          server=ENSEMBL_FTP_SERVER):
      
      ensembl_release, species, reference_name = normalize_release_properties(
          ensembl_release, species)
      subdir = _species_subdir(
          ensembl_release,
          species=species,
          filetype="fasta",
          server=server)
      server_subdir = urllib_parse.urljoin(server, subdir)
      server_sequence_subdir = join(server_subdir, sequence_type)
      filename = make_fasta_filename(
          ensembl_release=ensembl_release,
          species=species,
          sequence_type=sequence_type)
      return join(server_sequence_subdir, filename)
docs: Construct URL to FASTA file with cDNA transcript or protein sequences
  
      Parameter examples:
          ensembl_release = 75
          species = "Homo_sapiens"
          sequence_type = "cdna" (other option: "pep")