Like Y-DNA STRs, autosomal STRs are counts of repeated genetic code. As autosomal DNA recombines each generation, the number of markers shared with a specific ancestor is reduced by half each generation.
Heroin acts as a lipid soluble âprodrugâ within the brain, meaning that heroin itself is inactive but it is metabolized into an active form within the body. After crossing the blood-brain barrier, heroin is metabolized into morphine, which actively binds to opiate receptors in the brain producing the high.
Heroin is an opioid drug that is synthesized from morphine, a naturally occurring substance extracted from the seed pod of the Asian opium poppy plant.Heroin usually appears as a white or brown powder or as a black sticky substance, known as âblack tar heroin.â.nother drug called naloxone is sometimes used as an emergency treatment to counteract the effects of heroin overdose. For more information, see NIDAâs handbook, Principles of Drug Addiction Treatment. Chronic use of heroin leads to physical dependence, a state in which the body has adapted to the presence of the drug.