R-tpa

r-TPA
recombinant tissue plasminogen activator

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Rt-pc
computer RISC Technology Personal Computer. (Commonly, but incorrectly, known as the “PC-RT”, later changed to just “RT”) IBM’s first RISC-based Unix computer. The RT-PC was the predecessor to IBM’s RS/6000. It ran AIX 1.x and 2.x and had a PC-AT bus and IBM’s ROMP microprocessor. It was withdrawn from the marketing around 1989 or 1990. […]
Rt-pcr
RT-PCR reverse transcriptase-polymerase chain reaction
Rtr
abbreviation 1. Royal Tank Regiment