Importin alpha Export Receptor CAS, commonly known as Impα/Expα, is a protein involved in nucleocytoplasmic transport, a fundamental process in cellular biology. It functions as an α-karyopherin, facilitating the translocation of proteins into the nucleus. Synonyms for this vital cellular component include Importin alpha-binding protein NMDI3, Nucleodoxin-related importin-beta domain-containing protein 3, and KPNB3. These synonyms are often used interchangeably to describe the same protein, enhancing communication within the scientific community. Understanding the various names associated with Impα/Expα is crucial for researchers, as it aids in literature searches and consolidates findings related to this critical player in the regulation of gene expression.