The article discusses the recent advances in understanding the cellular regulation and function of actin nucleation factors, including the Arp2/3 complex, formins, and newly identified nucleation-promoting factors (NPFs) such as WASH, WHAMM, and JMY. Actin is a highly conserved protein in eukaryotic cells, involved in various cellular processes like morphogenesis, migration, and membrane transport. The Arp2/3 complex is a key actin nucleator that forms branched networks, while formins generate unbranched filaments. Recent discoveries have revealed additional nucleation factors, such as WASH, WHAMM, and JMY, which play distinct roles in actin dynamics. The article also explores the functions of NPFs, including WASP, N-WASP, WAVE, and others, which regulate actin nucleation through various mechanisms. The study highlights the importance of these factors in cellular processes such as endocytosis, cell motility, and membrane transport. The article concludes with a discussion of the roles of formins, including DRFs, FRL, DAAM, FMN, and FHOD, in actin assembly and their interactions with other cellular components. Overall, the article provides a comprehensive overview of the diverse mechanisms by which cells regulate actin nucleation and dynamics.The article discusses the recent advances in understanding the cellular regulation and function of actin nucleation factors, including the Arp2/3 complex, formins, and newly identified nucleation-promoting factors (NPFs) such as WASH, WHAMM, and JMY. Actin is a highly conserved protein in eukaryotic cells, involved in various cellular processes like morphogenesis, migration, and membrane transport. The Arp2/3 complex is a key actin nucleator that forms branched networks, while formins generate unbranched filaments. Recent discoveries have revealed additional nucleation factors, such as WASH, WHAMM, and JMY, which play distinct roles in actin dynamics. The article also explores the functions of NPFs, including WASP, N-WASP, WAVE, and others, which regulate actin nucleation through various mechanisms. The study highlights the importance of these factors in cellular processes such as endocytosis, cell motility, and membrane transport. The article concludes with a discussion of the roles of formins, including DRFs, FRL, DAAM, FMN, and FHOD, in actin assembly and their interactions with other cellular components. Overall, the article provides a comprehensive overview of the diverse mechanisms by which cells regulate actin nucleation and dynamics.