US-align: universal structure alignment of monomeric and complex proteins
and nucleic acids

References to cite:
(1) Chengxin Zhang, Morgan Shine, Anna Marie Pyle, Yang Zhang
    (2022) Nat Methods. 19(9), 1109-1115.
(2) Chengxin Zhang, Anna Marie Pyle (2022) iScience. 25(10), 105218.

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