Classifications of secreted factors. (IMAGE) Nanjing University School of Life Sciences Caption In addition to conventional secreted factors, cells also secrete ncRNA molecules (RNAkines). The molecular types of secreted factor are in bold, and representative examples or subfamilies, such as chemokines, are listed. The figure provides an overview of the diverse types of secreted factor contributing to intercellular signalling. Abbreviations: circRNA, circular RNA; lncRNA, long noncoding RNA; ncRNA, noncoding RNA; TNF, tumour necrosis factor. Figure created using BioRender (biorender.com/). Credit Chen-Yu Zhang Usage Restrictions not for republication License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.