CCAAT sequence specific DNA binding proteins, also known as CCAAT-binding proteins (CBPs), are crucial regulators of gene expression in eukaryotes. These proteins play a vital role in transcriptional activation or repression by binding to the CCAAT motif, a common DNA sequence found in many gene promoters. Synonyms for CBPs include CCAAT/enhancer-binding proteins (C/EBPs) and CCAAT-activating proteins (CAPs). C/EBPs are a family of transcription factors that control various biological processes, such as development, metabolism, and immune response. CAPs, on the other hand, are involved in activating gene expression by interacting with other regulatory proteins. These synonyms highlight the diverse functions and importance of CCAAT sequence specific DNA binding proteins in cellular processes.