Ihave a scab on the inside of my left nostril that clears my nose. i keep picking at it because, well, a lot of us have a bad habit of picking at scabs, and this one is the most interesting scab i've had. is that a problem?

Group of genes that encode molecules found in all body cells, creating a biochemical “fingerprint” that serves as the “id” for cells so that they are marked as “self” a) deoxyribonucleic acid (dna) b) entry inhibitors c) major histocompatibility complex (mhc) d) non-nucleoside reverse transcription inhibitors (nnrtis)