2.7.2.7 7.2 - - 642343 2.7.2.7 7.4 8.3 activation by Mg2+ 642348 2.7.2.7 7.5 - - 761102 2.7.2.7 7.5 - formation of butanoyl phosphate 642344 2.7.2.7 7.5 7.6 activation by Mn2+ 642348 2.7.2.7 8.5 - - 642349