CRX Regulates RdCVF Figure 1. Identification of the putative transcriptional start sites (TSSs) of the NXNL1 and NXNL2 genes. (A) Gel electrophoresis analysis of the RACE products. (B) Gel electrophoresis of the cloned RACE products. Arrowheads indicate the products that were sequenced. The numbers indicate the position of the putative TSSs relative to the ATG translation initiation codon. (C) Positions of the putative TSSs mapped onto the genomic sequences of the NXNL genes using the ATG as reference (+1). In all subsequent figures and in the text the position of the major putative TSS is defined as +1. doi:10.1371/journal.pone.0013075.g001 PLoS ONE | www.plosone.org 3 October 2010 | Volume 5 | Issue 10 | e13075