The Eastern Orthodox Church, comprising 14 or 15 autocephalous Orthodox hierarchical churches, is even more strictly a closed-communion Church. Thus, a member of the Russian Orthodox Church attending the Divine Liturgy in a Greek Orthodox Church will be allowed to receive communion and vice versa but, although Protestants, non-Trinitarian Christians, or Catholics may otherwise fully participate in an Orthodox Divine Liturgy, they will be excluded from communion. In the strictest sense, non-Orthodox may be present at the Divine Liturgy only up to the exclamation "The doors!