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A book of First Class stamps retin a gel 0.025 discontinued aj The iPTF research was based upon the original Palomar Transient Factory (PTF) project, which was setup in 2008 to explore supernovae, novae, extrasolar planets, compact binaries and solar system bodies, to name just a few. iPTF evolved to allow rapid follow-up of newly discovered supernovae, within hours of their detection.