TABLE 2.

Effect of N source on properties of the murein

Parameter	Strain and N source
	NCM3722 and NH3	NCM3722 and Arg	NCM3292 [glnL(Up)] and NH3	NCM3285 (glnG::Tn5) and NH3
Dipeptides (%)a	2	2	2	2
Tripeptides (%)a	15	27	19	18
Tetrapeptides (%)a	81	69	77	78
Pentapeptides (%)a	1	2	2	2
Degree of cross-linking (%)a	36	37	37	36
d-Ala-A2pm cross-links (%)a	33	32	33	33
A2pm-A2pm cross-links (%)a	2	5	4	3
Avg glycan chain lengthb	18	16	20	14

^aThe values are percentages of the total peptides.

^bNumber of disaccharide units, calculated by dividing the total number of disaccharide units by the number of 1,6-anhydromuramic acid residues.