abnormal heterochromatin tethering at nuclear periphery 2021-06-03T12:53:02Z FYPO:0007768 midori A cellular process phenotype in which heterochromatin tethering at the nuclear periphery is abnormal. Normally, heterochromatic parts of chromosomes, such as centromeres and telomeres, are maintained at the nuclear periphery by tethering to the nuclear envelope during all or part of the cell cycle. See GO:0072766, GO:0034398, and GO:0120109. abnormal heterochromatin localization to nuclear periphery chromosome region localization phenotype