Bernard Martin Odile Humbert Miguel Cámara Eric Guenzi John Walker Timothy Mitchell Peter Andrew Marc Prudhomme Geneviève Alloing Regine Hakenbeck Donald A. Morrison Graham J. Boulnois Jean-Pierre Claverys A highly conserved repeated DNA element located in the chromosome of Streptococcus pneumoniae. 3479-3483 1992 20 Nucleic Acids Research 13 db/journals/nar/nar20.html#MartinHCGWMAPAHMBC92