Ribosomal protein S9 (RPS9) is one of the 22 proteins which belong to the  of the bacterial ribosome. 
  3D Structures of Ribosomal protein S9 
Updated on 09-December-2014
 S9 in part of small ribosomal subunit
3iy8 - EcRPS9+EcRPS5+EcRPS6+EcRPS9+EcRPS8 EcRPS11+EcRPS12+EcRPS15+EcRPS16+EcRPS17+EcRPS18+Leishmania taretolae mRNA - Escherichia coli
3jyv – RPS9+RPS0+RPS2+RPS3+RPS5+RPS11+RPS13+RPS14+RPS15+RPS16+RPS18+RPS20+RPS22+RPS23+RPS29+18S RRNA+RACK1+S19E+tRNA – Cryo-EM -  Thermomyces lanuginosus
2r1g – TtRPS9+TtRPS12+TtRPS13+16S RRNA helices - Thermus thermophilus