We are interested in the molecular mechanisms that control the differential expression of the three sets of genes. In addition, we are interested in the evolution and phylogeny of these three sets of nitrogenase genes and their evolutionary origin. In situ expression of nif1 and nif 2. A and B differ only in that filaments in B were photographed with a 560-nm shortpass filter to block the red fluorescence of the biliproteins. Both photographs were taken with a 560-nm filter.
White arrows indicate heterocysts identified from light micrographs.
An overview of the genome of Nostoc punctiforme , a multicellular, symbiotic cyanobacterium. Thiel, T. and B. Pratte. Effect on heterocyst differentiation of nitrogen fixation in vegetative cells of the cyanobacterium Anabaena variabilis ATCC 29413. Thiel, T. Genetics and regulation of multiple nitrogenases in the cyanobacterium Anabaena variabilis ATCC 29413. Edited by T. Fatma.