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.
It contains up to 16% morphine, an opiate alkaloid, which is most frequently processed chemically to produce heroin for the illegal drug trade. Opium has gradually been superseded by a variety of purified, semi-synthetic, and synthetic opioids with progressively stronger effect, and by other general anesthesia.