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. 2008 Aug 15;4(8):e1000159. doi: 10.1371/journal.pgen.1000159

Figure 2. 1A-2 contains enhancer blocking and facilitator elements.

Figure 2

(A,B) β-galactosidase activity of independent transgenic lines carrying a derivative of the FBE1-yp2-LacZ transgene. The name and structure of the insertion is shown on the right, including the 3′ 157 bp 1A-2 fragment (P[F-1A-2(157)-yp2]), the 79 bp fragment with only two Su(Hw) BSs (P[F-1A-2(79)-yp2]), the 3′ 78 bp fragment combined with a Su(Hw) BR containing three copies of site 3 from the gypsy insulator (P[F-3R:3 1A-2(78)-yp2]), the 1A-2 78 bp fragment (P[F-1A-2(78)-yp2]) and four copies of the 3′ 1A-2 78 bp fragment (P[F-1A-2(78)×4-yp2]). Error bars indicate the standard deviation (n = 3). The vertical dashed line on the left represents the aau value for flies carrying P[F-gyp-yp2], while the vertical dashed line on the right represents the aau value for flies carrying P[F-yp2]. In B, the X-axis scale is increased three fold. Symbols are as described in Figure 1.