Fig. 3. Soybean PX fragment after prolonged homogenization. Some typical medium-sized fragments from the apical region of the hypocotyl are shown in (A-C). (A) Two lignified rings are interconnected with GRPCWM. A separation between the SW and the GRPCWM occurs preferentially near the lignified SW. However, some GRPCWM remains associated with the lignified SW (arrows), indicating that the SW and the GRPCWM are linked very tightly together. (B) The GRPCWM between two PX is still associated with a ring-shaped SW. Two other rings are missing but their original position remains visible (arrows). (C) Compression of the GRPCWM was sometimes observed between helical SW (arrowheads), whereas, at the end of the fragment, the GRPCWM is present in an extended form (arrow). The compression of the GRPCWM is explained by a shortening of the helical SW. Bars, 10 µm (A,B); 5 µm (C).