What's the difference between disentwine and untwine?

Disentwine

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Definition:

• (v. t.) To free from being entwined or twisted.

Example Sentences:

Untwine

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Definition:

• (v. t.) To untwist; to separate, as that which is twined or twisted; to disentangle; to untie.
• (v. i.) To become untwined.

Example Sentences:

• (1) Chromosomes partly untwine but remain attached at their kinetochores.