PCR Conditions: PCR was performed in a total volume of 20 microliters with 200 ng of genomic DNA, 8 pmoles of each primer, 2 mM MgCl2, 200 mM dNTP, 50 mM KC1, 5 mM Tris-HCl, pH 8.3, 0.01% gelatin, 0.5 U Taq polymerase (Boehringer). Primer Ang5 was 5' end labeled with P 7-ATP with the resulting specific activity 0.1-0.05 /iCi/pmol. Amplification was for 35 cycles with denaturation at 94°C 1 min,...