Table 1.

AESs within the PTC

Expansion segments	Helices	Nucleotide numbers (E. coli)
AES 1	H74, H75, H89	2061–2092; 2226–2245; 2435–2501
AES 2	H80	2246–2258; 2427–2434
AES 3	H90, H91	2053–2060; 2502–2546; 2567–2576
AES 4	H73, H93	2043–2052; 2577–2629
AES 5	H93	2547–2566