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| RCSI | RCSLT | RCT | RCT(s) | RCTDNA | RCTMS |
| RCX | RD | RD(C) | RD50 | RDA | RDAC |
| RDB | RDD | RDE | RDF | RDH | RDI |
| RDID | RDL | RDLD | RDM | rDNA | RDO |
| RDPGPE | RDS | RDT | RDTP | RDU | RDUK |
| RDW | RE | RE-LY | REA | REACH | REAL |
| REBA | REBT | REBUS | REC | RECIST | RECOMB |
| RED | REDIC | REET | REF | REGICOR | REGN |
| REH | REHAB | REHC | REHEX | REJ | REL |
| REM | REMEMBER | REMO | REMS | REO | REP |
| REPPCR | REPT | RER | RERI | RES | RESG |
| REST | RET | REV | REW | RF | RFA |
| RfAS | RFB | RFBD | RFC | RfD | RFD(S) |
| RFH | RFID | RFLP | RFM | RFN | RFO |
| RFP | RFR | RFS | RFT | RFUCMS | RFV |
| RG | RGC(s) | RGD | RGG | RGH | RGI |
| RGM | RGN | RGO | RGP | RGR | RGS |