TABLE 1.

Quantitation of FtsZ and FtsA in cells

Species and strain	No. of molecules/cell		Reference
	FtsZ	FtsA
E. coli
BL21 (B/rA)	15,000		106
B/rK	4,000a	740	162
W3110	10-14,000		157
	6,500a		149
	7,000a		37
MC4100	4,800		119
B. subtilis	6,250a	1,000	52
	5,500a	970	81
S. pneumoniae	3.750a	2,200	94
C. crescentus	9,500a		153
M. tuberculosis	30,000		44
M. smegmatis	12,000		44

^aThe FtsZ number has been increased by 25% from the reported value to account for the lower color of FtsZ relative to bovine serum albumin (BSA) in bicinchoninic acid (BCA) and Bradford assays (106, 119, 203).