The A form occurs under non-physiological conditions in partially dehydrated samples of DNA, while in the cell it may be produced in hybrid pairings of DNA and RNA strands, as well as in enzyme-DNA complexes.. 
Àwọn ẹ̀yà abinibi bí melo kan jẹ́ fíyìmọ́, àwọn míràn jẹ́ kíkó̀rù tàbí píparun nínú ogún tàbí pẹ̀lú àwọn àrùn tí àwọn ará Europe kò ran wọ́n tí ara wọn kò ní Àjẹsára sí.. 