Owl™ D4 Horizontal Electrophoresis System Combs Micro well comb 17Owl D4 Horizontal Electrophoresis System Combs Eliminate comb assembly with Thermo Scientific Owl D4 Horizontal Electrophoresis System Combs. These heavy duty, one piece microwell combs are for use with the Owl D4 Electrophoresis System. Ordering Information: Customized combs are available (Order SKU # XCM). Please contact your customer service or sales representative for further details. Description: Micro well comb For Use With: Thermo Scientific