Serine/threonine-protein kinase PAK 4 is an enzyme that in humans is encoded by the PAK4 gene. Serine/threonine-protein kinase PAK 5 is an enzyme that in humans is encoded by the PAK5 gene. Serine/threonine-protein kinase PAK 6 is an enzyme that in humans is encoded by the PAK6 gene. PAK4 is one of six members of the PAK family of serine/threonine kinases which are divided into group I (PAK1, PAK2 and PAK3) and group II (PAK4, PAK6 and PAK5/7). PAK4 localizes in sub-cellular domains of the cytoplasm and nucleus. PAK4 regulates cytoskeleton remodeling, phenotypic signaling and gene expression, and affects directional motility, invasion, metastasis, and growth. Similar to PAK1, PAK4-signaling-dependent cellular functions also regulate both physiologic and disease processes such as cancer, as PAK4 is overexpressed and/or hyperstimulated in human cancer, at-large. The PAK5 enzyme is one of three members of Group II PAK family of serine/threonine kinases, and evolutionary conserved across species. PAK6 belongs to the Group II PAK family members. Like other family members, PAK6 is also evolutionary conserved across species. Phospho-PAK4+PAK5+PAK6 (S474+S560+S602) Antibody detects endogenous levels of PAK4, PAK5 and PAK6 only when phosphorylated at serine 474, 602, or 560, respectively.