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Placement of DPDPE injection sites within the PAG of 14-day-old pups. The sections are adapted from the Sherwood and Timiras atlas (Sherwood and Timiras, 1971). Other details are as for the legend in Fig. 3. Fewer sites were positive, even at this age, than for DAMGO. With two exceptions, there were no sites above the aqueduct that produced latencies greater than 10 seconds and only one site was positive in the hindpaw test.
