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.
There have been many speculations about the effects that cannabis, or its active ingredient delta-9-tetrahydrocannabinol, has on the central nervous system (CNS). However, while THC may be the most active chemical substance in cannabis, there are over 400 different substances in cannabis.