  We study generalized cluster algebras introduced by Chekhov and Shapiro. When
the coefficients satisfy the normalization and quasi-reciprocity conditions,
one can naturally extend the structure theory of seeds in the ordinary cluster
algebras by Fomin and Zelevinsky to generalized cluster algebras. As the main
result, we obtain formulas expressing cluster variables and coefficients in
terms of c-vectors, g-vectors, and F-polynomials.
