TheImmEdge?Pen,ahydrophobicbarrierpenforimmunohistochemistryandinsituhybridization,isdesignedforusewithfrozenorparaffin-embeddedtissuesectionsmountedonglassslides.TheImmEdge?Penprovidesaheat-stable,water-repellentbarrierthatkeepsstainingreagentslocalizedonthetissuesections,preventsmixingofreagentswhendifferentiallystainingtwosectionsonthesameslide,andallowsuseoflessreagentspersection.