Colocalizes with actin filaments. Expressed in breast cancer cell lines (at protein level). Results from the insertion of a beta-actin fragment at the C-terminus in the POTEE paralog gene leading to the formation of a new functional chimeric protein. This insertion occured before the divergence of the Old World monkeys and apes. In the N-terminal section; belongs to the POTE family. In the C-terminal section; belongs to the actin family.