Pneumolysin
Pneumolysin is a putative virulence factor of the Gram-positive bacteria "Streptococcus pneumoniae" . 
<triplet> Pneumolysin <subj> virulence factor <obj> instance of <subj> Streptococcus pneumoniae <obj> found in taxon <triplet> Streptococcus pneumoniae <subj> Gram-positive <obj> Gram staining