normal nuclear morphology normal horsetail nucleus morphology midori Note that an abnormal nucleus organization process may, but does not necessarily, result in abnormal nuclear morphology. Consider also annotating to 'normal horsetail movement' (FYPO:0003835). normal horsetail nuclear morphology 2014-07-17T15:14:25Z FYPO:0003562 A physical cellular phenotype in which the size, shape, or structure of the horsetail nucleus is normal (i.e. indistinguishable from wild type). The horsetail nucleus forms during the rapid oscillatory movement at meiotic prophase I.