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.
The popularity of heroin as a drug of abuse reached a peak in the 1960s, but declined somewhat during the 1970s and 1980s due to greater awareness of the risks of overdose and the increased popularity of cocaine. The chemical name for heroin is diacetylmorphine. Street names include dope, horse, smack, and tar.