Figure 2From: The impact of cocaine and heroin on the placental transfer of methadoneEffect of methadone (+MTD), methadone plus cocaine (+MTD+COC) and methadone plus heroin (+MTD+HRO) on antipyrine transfer. Values are mean ± SD (n = 6) and expressed as percentage of control (CTR = 100%). *P < 0.01 vs. CTR, **P = 0.03 vs. CTR.Back to article page