What is the fine-grained topic of the following text: S. sanguis is similar to S. gordonii but can be differentiated based o­n the following; DNA homology, higher G+C content of the DNA (46 vs 42 mol%), doesn't ferment amygdalin, lacks alkaline phosphatase and B-glucosaminidase activities, has IgA1 protease activity, and by multilocus enzyme analysis [5,6]. Only return the topic.
Differentiating S. sanguis from S. gordonii based on various characteristics