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 a killer no matter how it is taken. Myth: Heroin is a drug abused only by older drug usersFact: For many years a large percentage of heroin users were aged 30 or older, but that number is changing. Heroin users are beginning to skew younger -and the average age of heroin users is now 21 years old.