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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Primary production increases with an increase in total phosphorus concentration. Primary production increases with an increase in total phosphorus concentration.
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it. In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
Examples of waste and hazard containers. Examples of waste and hazard containers.
How an Increase in Income Inequality Affects the Desired Tax Rate How an Increase in Income Inequality Affects the Desired Tax Rate
Effect of an Increase in gA,2 on Productivity and Output Effect of an Increase in gA,2 on Productivity and Output
How high a hill would a 75-kg hiker have to climb to increase her gravitational potential ... How high a hill would a 75-kg hiker have to climb to increase her gravitational potential ...
Video: Chloroplast Structure & Light Dependent Reactions (Photosystem 1 and 2 Cyclic Electron Flow)

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