Table 1.

Porphyrin content analysis of cell extracts from A. baylyi ADP1 wild-type and ACN1054 strains

Strain	Avg porphyrin concn (nM) ± SDa
	Total	Uroporphyrin	Heptacarboxyl porphyrin	Coproporphyrin	Protoporphyrin
ACN1054	4,802 ± 318	559 ± 81	81 ± 43	2,429 ± 149	1,734 ± 135
Wild type	BDb	BD	BD	BD	BD

^aQuantitation of porphyrins was done as described in Materials and Methods. Samples for analysis were obtained from 1 ml of 48-h A. baylyi ADP1 cultures grown in the presence of ALA.

^bBD, below detection level.