Staphylococcus phage Andhra upper tail structure, molecular model. The image shows the staphylococcus phage Andhra upper tail structure with the receptor-binding tail fibre (red, purple, yellow, green, blue), the upper collar protein (upper right), the tail stem protein (the central hollow cylinder), the SGNH_hydro domain-containing protein (between tail stem and tail fibre) and the portal-proximal core protein (upper right).