Fig. 1 From: Non-coding RNAs as potential therapeutic targets for receptor tyrosine kinase signaling in solid tumors: current status and future directionsClassification of RNAs. RNAs can be classified into two major groups, coding RNA and non-coding RNAs. Traditionally, ncRNAs were categorized based on their size as small ncRNAs and long ncRNAs. However, a more recent classification system has emerged, which distinguishes between two main groups: housekeeping ncRNAs and regulatory ncRNAsBack to article page