A specimen slide having a sample region in which a sample that can be investigated microscopically can be arranged, and that comprises reference points arranged at least in the sample region, is proposed. The method taught combines a first action of an agent which is to antagonize a drug-induced pain stimulus within nociceptive nerves of penile tissue with a second action of either the same agent or of a second agent, which enhances, synergistically, smooth muscle relaxation. However, if the electrostatic force has not been completely dissipated, the pins may have to push very hard against the wafer to dislodge it. A projecting portion 26a is provided in an outer surface on the opposite side of enclosing the core 23 by the first yoke 21 and the second yoke 22.