#pdbid|chain|deposition date|is S/K-not|(slip)knot types; 4xpg|A|2015-05-07|S|+3.1 4.1; 4xpt|A|2015-05-07|S|+3.1 4.1; 4xp9|C|2015-05-07|S|+3.1 4.1; 4xp4|A|2015-05-07|S|+3.1 4.1;