Figure 2: Chromosomal distribution of silkworm BTB protein genes. In total, 53 of the identified silkworm BTB protein genes (i.e., all except BTBD20, BTBD21, and ZBTB13) were localized to specific chromosomes based on the whole-genome sequence and single-nucleotide polymorphism (SNP) marker linkage map for the silkworm. The chromosome number of each gene was indicated above.