. . . "Specifies whether a conversion occurs spontaneously (i.e. uncatalyzed, under biological conditions) left-to-right, right-to-left, or not at all. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . "Specifies whether a conversion occurs spontaneously (i.e. uncatalyzed, under biological conditions) left-to-right, right-to-left, or not at all. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . "Specifies whether a conversion occurs spontaneously (i.e. uncatalyzed, under biological conditions) left-to-right, right-to-left, or not at all. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . . . .