cl21459: HTH Superfamily (this model, PSSM-Id:451250 is obsolete)
Helix-turn-helix domains
A large family of mostly alpha-helical protein domains with a characteristic fold; most members function as sequence-specific DNA binding domains, such as in transcription regulators. This superfamily also includes the winged helix-turn-helix domains.
Jiyao W et al.(2023). "The conserved domain database in 2023.",