Figure 4From: Lysis of tubercle bacilli in fresh and stored sputum specimens: implications for diagnosing tuberculosis in stored and paucibacillary specimens by PCREffect of storage on recovery of PCR-amplifiable DNA from supernatant fractions. Lane 1, fresh supernatant (FS); lane 2, supernatant of 1 month-stored sample (S1). A, B, C and D represent four different samples.Back to article page