Bio-Rad Model 491 Prep Cell and Mini Prep Cell - Manual (Page 12)

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2.6 Casting Stand
Gels are cast with the gel tube assembly mounted directly on the casting stand. The casting stand ensures
that gels have perfectly flat lower surfaces. Inserting a spatula in the gel-release slot facilitates the removal of
the gel from the casting stand after polymerization by allowing air to enter beneath the gasket and the gel.
Fig. 6. Casting stand. Leveling feet (1), center pin (2), leveling bubble (3), and gel re lease slot (4).
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