CRYSTAL STRUCTURE OF THE BACTERIAL RIBOSOME FROM ESCHERICHIA COLI IN COMPLEX WITH GENTAMICIN AND RIBOSOME RECYCLING FACTOR (RRF). THIS FILE CONTAINS THE 30S SUBUNIT OF THE SECOND 70S RIBOSOME, WITH GENTAMICIN BOUND. THE ENTIRE CRYSTAL STRUCTURE CONTAINS TWO 70S RIBOSOMES AND IS DESCRIBED IN REMARK 400.