The right lung of the river otter is larger than the left, having four lobes compared with two for the left . Reduced lobulation of the lungs is presumed to be adaptive for underwater swimming.
2.
When the truncated prelamin A is localized to the nuclear envelope, it will not be processed and accumulates, leading to " lobulation of the nuclear envelope, thickening of the nuclear lamina, loss of peripheral heterochromatin, and clustering of nuclear pores ", causing the nucleus to lose its shape and integrity.
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