For algebraically coisotropic X in holomorphic symplectic projective M that is an abelian variety and not uniruled, up to finite etale cover (X,M) is a product with Lagrangian Z in N; when K_X is nef and big, X is Lagrangian in M.
Ueno, Classification theory of algebraic varieties and compact complex spaces (Notes written in collaboration with P
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On algebraically coisotropic submanifolds of holomorphic symplectic manifolds
For algebraically coisotropic X in holomorphic symplectic projective M that is an abelian variety and not uniruled, up to finite etale cover (X,M) is a product with Lagrangian Z in N; when K_X is nef and big, X is Lagrangian in M.