1. Confocal stereo micrographs comparing (right) wild-type Arabidopsis chloroplasts in palisade mesophyll cells (var Columbia) with (left) those in Arabidopsis with a mutation in an FtsZ gene. Both micrographs at the same magnification. Wild-type chloroplasts are normal size and shape, while the mutant type are much larger, having failed to divide as often as normal. Stereo viewing also shows chloroplasts in stomatal guard cells, "floating" in the foreground - they too are larger and fewer in the mutant. The mutation was originally called pmi4 (plastid motility impaired) but the affected gene is for the AtFtsZ1-1 protein.

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