The multiSUB-4 is a compact system capable of running a maximum 1200 samples simultaneously by stacking up to 4 horizontal gels. This achieves high sample throughput while maintaining the time- and space-saving advantages of a small, compact unit. Each multiSUB-4 is supplied with 4 gel trays and 8 combs as standard, while additional trays and combs may be purchased as required. Two double-sided comb and three tray length formats are also available. An optional flexicaster, either supplied separately or as a package with the multiSUB-4, is also available that allows up to four 8x6, 8x12 and 8x18cm multisUB-4 gel trays to be cast simultaneously outside the tank.