def _map_reactions_to_kinetic_parameters(reactions, enzrxns):
    """Get mapping of enzyme reactions to kinetic parameters."""
    for reaction in reactions.values():
        try:
            for enzrxn in reaction['enzymes']:
                try:
                    enzrxn_dict = enzrxns[enzrxn]
                except KeyError:
                    pass
                else:
                    for k, v in enzrxn_dict.items():
                        if k != 'enzyme':
                            reaction.setdefault('enzrxns', {}).setdefault(
                                enzrxn, {}).setdefault(k, v)
        except KeyError:
            pass
