Assertion: morphine | /r/CapableOf | provide information
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text: Morphine has relative selectivity for the µ opioid receptor, although at higher doses it has been shown to have interaction with the κ and δ opioid receptors.3,4 Detection of morphine on a urine drug test provides information that morphine or a substance that metabolizes or contains morphine has been ingested in the preceding 2 to 4 days (Table 1).