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 made from morphine, a natural substance taken from the seed pod of the Asian opium poppy plant. Heroin can be a white or brown powder, or a black sticky substance known as black tar heroin. Other common names for heroin include dope, horse, junk, and smack.