"basic" ba kalma ba ce a cikin harshen Ingilishi. Duk da haka, akwai kalmar da ake kira "basic site" wanda wani nau'i ne na raunin DNA. Wuri na asali shine wuri a cikin DNA inda aka rasa ko cire tushe, yana barin rata a cikin kashin bayan sukari-phosphate. Ana iya haifar da waɗannan rukunin yanar gizon ta hanyar lalacewa da sauri ko kuma ta hanyar kamuwa da sinadarai ko radiation, kuma suna iya yin katsalanda ga kwafin DNA na yau da kullun.