Figure 9.—

osw1 forms aberrant PSMs and SWs. osw1 cells were analyzed as described. Open arrowheads in E and F, electron-dense materials around the surface of the SW. N, nucleus (numbered in A–C); PSM, prospore membrane; ISW, inner spore wall. (A) N1 and N2 are being engulfed by a PSM, while N3 does not have any PSM. (B) N1, N3, and N4 have PSMs, while N2 does not. (C) N2 is fully encapsulated by a PSM and an incipient SW structure is discernible, while N1 does not show any PSM formation. Bar, 500 nm.