Position of type-1 15-PGDH primers. The 15-PGDH coding sequence of the 2.0 kb mRNA is represented as a box and the resting noncoding sequence is represented as a solid line. The positions of the primers are noted with arrows. Primers specific to PGHS-2 (COX2) nucleic sequence are boxed. Numbers noted in labeling correspond to the positions of the primers in original sequences.