The JYFLTRAP mass spectrometer was used to measure the masses of neutron-rich nuclei in the region of 28 \leq N \leq 82 with uncertainties better than 10 keV. The impacts on nuclear structure and the r-process paths are reviewed.
PACS numbers: 21.10.Dr, 07.75.+h, 27.50.+e, 27.60.+j
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