Fig. 1

The mini gel cassette and its diagrams. a Mini gel cassette with base (a1), tray (a2), smooth glass plate (a3) and a set of hole-making molds (a4); b Assembly drawing of the invented device. Diagrams of the base (c), the tray (d) and three representative hole-making molds (e). e1 hole-making mold with well spacing ranging from 3.5 to 7.0; e2 hole-making mold with six-well (parallel arrangement); e3 hole-making mold with seven-well (six-well around a centre). Units: mm