Stresses enhance cell death in the cyanobacterium.

<p>(<b>A</b>) Percentage of cyanobacterial cells affected by the various death modes identified in relation to two plant developmental stages. (<b>B</b>) Cyanobacterial filaments (leaf no. 13) showing a strong Annexin V-EGFP signal in most cells and in all cell types, indicating a strong enhanced cell death in the majority of cells. C, control cells; DK, dark treated; ND, nutrient deprived; RT, radiation treated. v, vegetative cells; h, heterocysts; A, akinetes. Scale bar: 10 µm.