In some specific archival contexts, "RAR" can also stand for the or Royal Australian Regiment . If the papers are historical or military in nature, they may refer to:

: Research on how extranuclear RARα controls TCR signal transduction and T-cell activation.

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: High-dimensional studies that use immune cell quantification to partition human renal inflammation , often comparing conditions like Lupus Nephritis (LuN) and Renal Allograft Rejection (RAR).

Based on common academic indexing, a file named "COL-1-4" containing "long papers" likely includes deep-dive research into:

: Studies on the protease-resistant PML-RARα fusion protein and its role in Acute Promyelocytic Leukemia (APL). Military/Administrative Context