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Front cover illustration

Micrographs of Anabaena cf. crassa 1tu27S7 (top), Aphanizomenon flos-aquae 1tu26s2 (middle) and Anabaena circinalis 1tu30s11 (bottom). Images courtesy K. Sivonen, Helsinki University, Finland. See the article by Rajaniemi et al. in this issue, pp. 11-26.