A composite of agarose gels depicting the products of mouse ADAMTS13 mRNA by RT-PCR. mRNA isolated from the livers of a FVB/NJ mouse and a C57BL/6J mouse was reverse transcribed and amplified with the indicated primer pairs. The analysis yielded similar levels of products with primer pair PP2 but much lower levels of products with primer pairs PP3 or PP4 in C57/BL/6J mice, suggesting that most of the mRNA was truncated. The approximate locations of the primers are illustrated in the bottom panel.