the tubules were seen in about 10 % of virus-containing cells at the stage when the virus matured by budding at the nuclear membrane , measured 160-180 nm in diameter and up to 3.6 mum in length , were bounded by an outer `` '' membrane '' '' and contained beneath this an electron dense repeating structure arranged either as a coil or a series of evenly spaced rings .
C0007634
cells
C0028584
nuclear membrane