May play a role in chromatin structure and function. Two transcripts are detected of sizes 1.9 and 2.2 kb. Both are detected soon after fertilization and show relatively constant expression during the first 2/3 of embryogenesis. In 0-3 hours embryos, the smaller transcript is predominant and the levels of the two transcripts are somewhat reduced at the later stages of development, but they are found in approximately constant amounts during larval, pupal and adult stages. The smaller transcript is suspected to be a maternal transcript. Belongs to the SNW family.