PERSON@1 used two strains of Pneumococcus -LRB- which infects mice -RRB- , a type III-S -LRB- smooth -RRB- and type II-R -LRB- rough -RRB- strain .

PERSON@1 used two strains of Pneumococcus . He used a type III-S -LRB- smooth -RRB- and type II-R -LRB- rough -RRB- strain .
