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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Neurosci Biobehav Rev. 2008 May 15;32(7):1236–1248. doi: 10.1016/j.neubiorev.2008.05.012

Fig. 1.

Fig. 1

Scent marks of C57 male mice fixed and colored by ninhydrin spray. A C57 male was introduced into a rectangular cage which was placed upside-down on a rough newsprint paper for 20 minute. Following removal of the mouse, the ethanol with ninhydrin was sprayed on the paper sheet and the sheet was left to be dried for 24 hours in room temperature. A large round shaped urine spot on an upper left portion of the sheet was counted as a urine pool.