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. 2005 Feb;187(3):1074–1090. doi: 10.1128/JB.187.3.1074-1090.2005

TABLE 2.

Effect of N source on properties of the murein

Parameter	Strain and N source
Parameter	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 length^b	18	16	20	14

^a

The values are percentages of the total peptides.

^b

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