HBB CDS 444 nt
sources (fetched 2026-08-12, exact match):
  NCBI efetch NM_000518.5 rettype=fasta_cds_na (NP_000509.1, location 51..494)
  Ensembl REST ENST00000335295.4 type=cds
checks: length 444; ATG start; TAA stop; translation = known beta-globin (MVHLTPEEK...), 146 aa + Met
