Gordian

The final disentanglement of sister chromatids can only be achieved by cleavage of the "gordian knot" by separin.

This fire, like the eye of gordian snake, Bewitch'd me towards; and I soon was near A sight too fearful for the feel of fear: In thicket hid I curs'd the haggard scene-- 500 The banquet of my arms, my arbour queen, Seated upon an uptorn forest root; And all around her shapes, wizard and brute, Laughing, and wailing, groveling, serpenting, Shewing tooth, tusk, and venom-bag, and sting!