the observations are combined with others , made on pre-prophase bands and on the substructure of cortical arrays lying against the faces of cells , to develop an hypothesis on the development of cortical microtubules , summarised below : microtubules are nucleated along the edges of cells , at first growing in unspecified orientations and then becoming bridged to the plasma membrane .
C0007634
cells
C0026046
microtubules