Fig. 3From: Prevalence of Mouse Mammary Tumor Virus (MMTV)-like sequences in human breast cancer tissues and adjacent normal breast tissues in Saudi ArabiaSensitivity of the newly designed primers for the detection of MMTV-env like sequences. A serial dilution of the positive control was used as template for the PCR reaction using MMTV F&R primers. Amplicon size is 187Â bp. The numbers indicate the calculated copy number of the positive control fragment per microliter. Four microliters were used per reaction. Detection level is 250 copies per ml. (M) 100Â bp DNA ladderBack to article page