Zinc finger proteins have regions (zinc finger domains) consisting of cysteines and histidines or cysteines alone which can form a tetrahedral complex around a Zinc ion. Zinc finger represent a class of DNA-binding proteins, act as transcriptional regulators of other genes. These multifunctional transcription factors exhibits control on a large number of cellular genes by binding to sites overlapping the transcription start site and plays an important role in development and differentiation. Hromas et al. in an effort to identify activators of the genetic cascade in hemopoietic differentiation probed a human myeloid cDNA library. ZNF42 may be a regulator of transcriptional events during hemopoietic development.