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Published online by Cambridge University Press: 22 December 2003
We have discovered 22 GHz water vapor maser toward a narrow-line type 1 (NLS1) Seyfert galaxy, NGC4051. The detection of water masers insuch galaxies is very rare. The Doppler-shifted maser componentssymmetrically straddle a component lying at about 712 km s-1. Thelocation of each maser component is of great interest for studyinggalactic dynamical structures around an active nucleus. We report onpreliminary results of VLA observations.