This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
PDB fr EBI. All alpha proteins Fourhelical upanddown bundle Histidinecontaining phosphotransfer domain HPT domain Aerobic respiration control sensor protein ArcB Aerobic respiration control sensor protein ArcB EBI fr November Aerobic respiration control sensor protein ArcB Files uploaded by Nichalp's script