|q17=Pyrrolizidine alkaloids have an anti-mitotic effect whilst allowing continued synthesis within the cell and its nucleus. This causes a marked increase in the size of parenchymal cells, a phenomenon termed - | |q17=Pyrrolizidine alkaloids have an anti-mitotic effect whilst allowing continued synthesis within the cell and its nucleus. This causes a marked increase in the size of parenchymal cells, a phenomenon termed - |