Streptococcus pneumoniae (26) show (21) pathogen (19) Streptococcus (15) Performance (12) Cells (12) DNA (11) DNA (11) Bacteria (11) model (10) Example (10) antibiotic (9) analysis (9) Genes (9) Analysis (9) gene (8) Development (8) Human beings (8) resistance (8) wall (7) regulation (7) Expression (7) Regulation (7) mutant (6) Control (6) Genetic transformation (6) Comprehension (6) Cell division (6) stress (5) protein (5)