  After a brief review of quark-lepton relations in grand unified theories
(GUT), we show that the Pati-Salam relation with only one type of Higgs field
configuration with "four zero symmetric texture" can reproduce two large
neutrino mixings as well as observed mass differences. This is quite in
contrast to the case of SU(5) where bi-large mixings essentially come from the
charged lepton sector with non-symmetric charged lepton mass matrix.
