Cis-regulatory RNA elements are non-coding RNA sequences that regulate gene expression within a cell. They play a crucial role in various cellular processes and are important in the development of organisms. Synonyms for cis-regulatory RNA elements include cis-acting RNA sequences, non-coding RNA elements, regulatory RNA elements, and post-transcriptional regulatory RNA. Cis-acting RNA sequences are the RNA elements that regulate gene expression within the same molecule of RNA, whereas non-coding RNA elements work to control gene expression in the genome that they are located in. Regulatory RNA elements are non-coding sequences that can interact with other RNA molecules or proteins to influence gene expression. Post-transcriptional regulatory RNA modulates gene expression after the molecule has been transcribed.