ENZYMATIC SYNTHESIS OF ANALOGS OF THE CELL-WALL PRECURSOR. I. KINETICS AND SPECIFICITY OF URIDINE DIPHOSPHO-N-ACETYLMURAMYL-L-ALANYL-D-GLUTAMYL-L-LYSINE:D-ALANYL-D-ALANINE LIGASE (ADENOSINE DIPHOSPHATE) FROM STREPTOCOCCUS FAECALIS R.