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Frames 1–3 were taken from Movie S2 and illustrate the transformation of an IM (IM, green) to an OsM (green) and finally the OM (black) of an outgrowing cell. A yellow star is used to show that the IM also gets inverted in the process. PG is shown in red and is present in the septum throughout engulfment, elaborating to form the cortex of the mature spore and then degrading to restore the thin cell wall of the outgrowing cell.
