string: ‚Ä¶used sections taken from female Wistar and male Long Evans rat brains stained for acetylcholinesterase (Loyez, 1910; Kluver and Barrera, 1953; Tago et al., 1986) or BlackGold s2 myelin stains (Schmued et al., 2008), as well as SMI-32 (Voelker et al., 2004) or calretinin (Wouterlood et al., 2007).