The "An" and "RAR" suffix could point toward biological research into Retinoic Acid Receptors [1]. Detailed papers on this topic cover the structural and physiological effects of RARs and their cooperation with retinoid X receptors (RXRs).
"RAR" also stands for the Relationships Among Rivals framework used in political science and process-tracing research [2]. Where to Find the Actual Paper Uk-Su-An.rar
: Often hosts self-archived papers and datasets from individual researchers [3]. The "An" and "RAR" suffix could point toward