The regenerative loop motif is a motif found in some catalysts where a loop motif that has been perturbed in a certain way hits a block then restores itself.
The most common catalyst using a regenerative loop is a replacement catalyst for the tub used in conduits such as ST42Db, PNE−6T40_SE−6T40, and HSE44T39. It works when the tub is turned into a certain block predecessor.
x=34, y = 39, rule = B3/S23
27b2o$26b2o$25b2o$bo5bo2$2b2ob2o$4bo3$5bo19bo$4bobo17bobo$5bo19bo10$27b2o$26b2o$25b2o$bo5bo2$2b2ob2o$4bo3$5bo19bo$4bobo17bobo$3bobo17bobo$b3o2b3o3b2o7b3o2b3o3b2o$o3b2o3bo2b2o6bo3b2o3bo2b2o$b3o2b2obo11b3o2b2obo$3bobo2bo14bobo2bo$4bobo17bobo$5bo19bo!
[[ THEME 6 GRID THUMBNAIL THUMBSIZE 2 ]]However, there are other examples, such as this glider eater.
x=28, y = 27, rule = B3/S23
bo$2bo$3o5$8bo$9bo$7b3o5$15bo$16bo$14b3o$21b2ob2obo$22bobob2o$22bo$19b2obo$20bob2o$12b2o3b3o$12b2o2bo$16bob2o$17bo2bo$19b2o!9bo$10b2o8b2o!
[[ THEME 6 X 4 Y 4 ZOOM 14 AUTOSTART GPS 21 LOOP 28 GRID THUMBNAIL THUMBSIZE 2 ]]