ThesisCharacterization of an aminopeptidase gene expressed in akinetes, vegetative, hormogonia and heterocysts of Nostoc punctiformeIreland, JosephNostoc punctiforme is a filamentous cyanobacterium capable of multiple cellular differentiation from vegetative cells into akinetes, heterocysts and hormogonia. In order to control this differentiation, tight regulation of gene expression is required. . . .