Table 1. Summary of heterologous expression experiments. See ESI for details of construction of expression vectors and detailed chromatograms of each experiment. *Minor component.

Exp.	citS	mrl1/CitA	mrl2/CitB	mrl4/CitD	mrl6/CitE	mrl7/CitC	Products
1	X	—	—	—	—	—	2
2	X	X	—	—	—	—	2, 3*
3	X	X	X	—	—	—	2*, 3*, 4
4	X	X	X	X	—	—	5*, 6*, 7*
5	X	X	X	—	—	X	2*, 3, 4*, 8, 9
6	X	X	X	—	X	—	2
7	X	X	X	X	—	X	5*, 6, 7
8	X	X	X	—	X	X	2*, 3, 4*, 8
9	X	X	X	X	X	—	1*, 5*, 6, 7
10	X	X	X	X	X	X	1, 2*, 4*, 5*, 6, 7