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Phylogenetic analysis of silkworm-specific SP and SPH genes . (A) Neighbor-joining tree of silkworm-specific SP and SPH genes. Genes in SP_fam13, SP_fam14, SP_fam15, SP_fam16, SP_fam17 are in gray, red, green, blue and yellow, respectively. (B) Schematic picture of the distribution on chromosome for genes of SP_fam13, SP_fam14, SP_fam15, SP_fam16 and SP_fam17. The arrowhead indicates the transcriptional orientation of genes.
