Reverse transcription/PCR analysis of murine liver and pancreas for factor XI expression. PolyA RNA from liver (L) and pancreas (P) were reverse transcribed as described in Materials and Methods, followed by PCR with oligonucleotides specific for the murine factor XI or murine p53 cDNAs. PCR products were size fractionated on a 2.0% agarose gel followed by staining with ethidium bromide. The position of molecular weight markers in DNA kilobases is shown at the left of the figure.