The excision of sample spots from a gel or membrane by pressing a cutting tool terminating in a hollow cylinder against the gel or membrane supported on {TAIL ~ a rigid surface} is made more reliable by interposing a relatively pliable, intermediate layer on the side of the surface facing {HEAD ~ the gel} or membrane 
The excision of sample spots from a gel or membrane by pressing a cutting tool terminating in a hollow cylinder against the gel or membrane supported on { TAIL ~ a rigid surface } is made more reliable by interposing a relatively pliable , intermediate layer on the side of the surface facing { HEAD ~ the gel } or membrane
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