
Structure of the human (H), mouse (M), chicken (C), pufferfish (P), and zebrafish (Z) SCL loci. All loci are drawn to the same scale. Boxes represent exons and arrows indicate gene orientation. The gray shading illustrates the variation in size of the five vertebrate SCL loci. Numbering refers to distances in kilobases. Only the 3′ ends of the human, mouse, and chicken SIL genes are shown.











