RASGEF1B (RAS Guanine Nucleotide Exchange Factor 1B): RASGEF1B is a gene that encodes a guanine nucleotide exchange factor responsible for activating Ras proteins, which transmit signals within cells. It is believed to play a role in neural development and function. RASGEF1B may influence cellular processes such as growth and differentiation, and its dysregulation could be involved in developmental disorders and cancer progression.