Bio-Rad Mini-PROTEAN® Tetra Cell - Manual (Page 15)

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Important Note: Do not attempt to lock the green arms of the
clamping frame, without first ensuring that the gel cassettes are
perfectly aligned and stabilized against the notches on the green
gaskets of the module. To prevent the gels from shifting during
the locking step, firmly and evenly grip them in place against the
core of the module with one hand.
Caution: When running 1 or 2 gels only, do not place the
companion running Module in the tank. Doing so will cause
excessive heat generation and prevent electrophoretic
separation.
Fig. 4. Assembling the Mini-PROTEAN Tetra cell electrophoresis module.
4a 4b
4c
4d
4e