There are multiple definitions:

1. atonal basic helix-loop-helix transcription factor 1(English)

   • an important factor for maintaining the balance of cell proliferation and differentiation in tumorigenesis
   • bHLH
   • Transcription, Oncology
   • https://doi.org…2/ol.2020.11833

2. atonal homolog 1(English)

   • transcription factor that has multiple homologues which are functionally conserved across species and is responsible for the generation of sensory hair cells
   • HES5, hWJC, SNHL, HES1
   • Transcription, Auditory system, Biomaterials
   • https://doi.org…n.tea.2014.0340