title: A genetic factor on the DNA molecule capable of depressing the frequency of transformation at a linked site.
mesh_terms: D001419:Bacteria / Q000235:genetics*; D004247:DNA / Q000235:genetics*; D013296:Streptococcus pneumoniae / Q000235:genetics*
chemical_list: D004247:DNA
keywords: BACTERIA/genetics; DESOXYRIBONUCLEIC ACID/genetics; DIPLOCOCCUS PNEUMONIAE/genetics