Chromosomal cohesin forms a ring.

By S. Gruber, C. Haering, Kim Nasmyth. Cell, 2003

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Cohesin: its roles and mechanisms. (2009, background): “Cleavage of only one strand has little or no effect on cohesin’s activity, but simultaneous cleavage triggers cohesin’s dissociation from chromosomes (44, 69).”
Cohesin and CTCF differentially affect chromatin architecture and gene expression in human cells (2013, methodology): “Similar systems have been used before to study cohesin in yeast and fly (14, 16, 17).”
Genome-Wide Mapping of the Cohesin Complex in the Yeast Saccharomyces cerevisiae (2004, neutral): “These proteins have recently been proposed to form a ring structure that encircles sister chromatids (Gruber et al. 2003).”