BAC microarray characterization of a 9q33.1 deletion. The zoomed-in microarray plot shows a single-copy loss of three BAC clones from the long arm of chromosome 9 at 9q33.1, approximately 262 kb in size (chr9: 119,452,279-119,714,054 based on UCSC 2006 hg 18 assembly). The nearest distal clone on chromosome 9 that is not deleted is RP11-977E8 and is approximately 4.0 Mb away from the deleted region. The nearest proximal clone on chromosome 9 that is not deleted is RP11-999I23 and is approximately 4.4 Mb away from the deleted region. Probes are ordered on the x axis according to physical mapping positions, with proximal 9q32 clones to the left and distal 9q33.2 clones to the right. Below is a schematic of the deletion region. Vertical blue lines represent the minimum size of this alteration, which encompasses one gene, TLR4.