This gene is a member of the large Serpin gene family. Many members of this family act as protease inhibitors, and have a conserved structure including a reactive center loop (RCL) that can act as a bait for protease targets. Unlike some members of this large gene family, the protein encoded by this gene is an intracellular protein, and lacks an N-terminal signal peptide sequence. Alternate splicing results in multiple transcript variants. A pseudogene of this gene is found on chromosome 13. [provided by RefSeq, Jul 2014]