the leucoplast of late interphase cells still had a deep cup shape ( cyathiform ) , but several structural modifications were observed compared to the leucoplast of young interphase cells : either a thin and less perforated sheet-like area , taking up ca 25 % of the external surface , and several double-layered areas occur sporadically at the tube-shaped part of the cup , or a bladder-shaped structure consisting of several very thin concentrically ringed layers occurred at the base of the tube .
C0007634
the
C0021798
interphase