Defective ultrastructures in the <i>tyn</i>^<i>1</i> mutant.

(A, B) TEM images of the taenidial folds in y2, cho2, v1 (A-A”) and tyn1, y2, cho2, v1 (B-B”) in embryonic stage 17 trachea. A’, A”, B’ B” are enlarged views of the regions indicated by rectangles in A, A’, B, B’, respectively. Arrowheads in A’ indicate a pore-like structure we called the “taenidial channel” (TC). Dotted lines: plasma membrane. Arrow in B’: a prominent protrusion of the tracheal cell. Scale bars: 500 nm in A and B, 200 nm in A’ and B’, and 50 nm in A” and B”.