| Table S1. Proteins of the Intimin/Invasin Family Included in this Study Listed Alphabetically | |||||
| Protein Abbreviation | Organismal Source | Cluster | ProteinSize | GenBankIndex# | Group |
| Ahy1 | Aeromonas hydrophila subsp. hydrophila ATCC 7966 | T | 916 | 117619710 | g |
| Bav1 | Bordetella avium 197N | F | 747 | 187477361 | b |
| Bav2 | Bordetella avium 197N | F | 1654 | 187477403 | b |
| Bbr1 | Bordetella bronchiseptica RB50 | F | 969 | 33599102 | b |
| Bpa2 | Bordetella parapertussis 12822 | F | 1937 | 33594824 | b |
| Bpe1 | Bordetella pertussis Tohama I | F | 1308 | 33592249 | b |
| Cko1 | Citrobacter koseri ATCC BAA-895 | B | 454 | 157145552 | g |
| Cla1 | Campylobacter lari RM2100 | I | 1459 | 222778515 | e |
| Csu1 | Chlamydia suis | K | 1305 | 69204798 | Chlamydiae |
| Eal1 | Escherichia albertii TW07627 | W | 725 | 170767304 | g |
| Eca1 | Enterobacter cancerogenus ATCC 35316 | B | 468 | 209908385 | g |
| Eco1 | Escherichia coli | O | 937 | 215489850 | g |
| Eco10 | Escherichia coli | W | 734 | 32186995 | g |
| Eco14 | Escherichia coli E24377A | S | 1084 | 157157710 | g |
| Eco15 | Escherichia coli O157:H7 EDL933 | V | 1700 | 15804908 | g |
| Eco16 | Escherichia coli O127:H6 str. E2348/69 | W | 711 | 215487854 | g |
| Eco20 | Escherichia coli | U | 1418 | 71979957 | g |
| Eco25 | Escherichia coli O157:H7 | V | 2660 | 20455388 | g |
| Eco26 | Escherichia coli 53638 | P | 1653 | 188574072 | g |
| Eco3 | Escherichia coli O157:H7 EDL933 | B | 417 | 15801451 | g |
| Eco6 | Escherichia coli IAI39 | V | 2836 | 218702502 | g |
| Efe2 | Escherichia fergusonii ATCC 35469 | V | 1089 | 218549138 | g |
| Efe3 | Escherichia fergusonii ATCC 35469 | V | 2104 | 218551120 | g |
| Efe4 | Escherichia fergusonii ATCC 35469 | D | 672 | 218548924 | g |
| Efe5 | Escherichia fergusonii ATCC 35469 | X | 1185 | 218549119 | g |
| Esa2 | Enterobacter sakazakii ATCC BAA-894 | S | 1027 | 156933176 | g |
| Esa3 | Enterobacter sakazakii ATCC BAA-894 | B | 471 | 156933694 | g |
| Esp2 | Enterobacter sp. 638 | B | 468 | 146311965 | g |
| Eta1 | Erwinia tasmaniensis Et1/99 | P | 1400 | 188535206 | g |
| Eta2 | Erwinia tasmaniensis Et1/99 | B | 480 | 188533998 | g |
| Kpn1 | Klebsiella pneumoniae subsp. pneumoniae MGH 78578 | B | 460 | 152970765 | g |
| Mba1 | Methylophilales bacterium HTCC2181 | G | 331 | 118594627 | b |
| Pal2 | Providencia alcalifaciens DSM 30120 | C | 2521 | 212710278 | g |
| Pal3 | Providencia alcalifaciens DSM 30120 | P | 542 | 212711721 | g |
| Pan1 | Pantoea ananatis | B | 490 | 188035728 | g |
| Pas1 | Photorhabdus asymbiotica subsp. asymbiotica ATCC 43949 | L | 924 | 211638304 | g |
| Plu1 | Photorhabdus luminescens subsp. laumondii TTO1 | M | 1695 | 37525974 | g |
| Plu2 | Pelodictyon luteolum DSM 273 | H | 302 | 78186442 | Chlorobi |
| Pma1 | Prochlorococcus marinus str. MIT 9312 | E | 372 | 78779562 | Cyanobacteria |
| Pma3 | Prochlorococcus marinus str. MIT 9215 | E | 379 | 157413600 | Cyanobacteria |
| Pma4 | Prochlorococcus marinus subsp. marinus str. CCMP1375 | E | 410 | 33240740 | Cyanobacteria |
| Pma5 | uncultured Prochlorococcus marinus clone ASNC3046 | E | 373 | 91069978 | Cyanobacteria |
| Pmi1 | Proteus mirabilis HI4320 | P | 2358 | 197283938 | g |
| Pru1 | Providencia rustigianii DSM 4541 | P | 2373 | 212706386 | g |
| Psp2 | Candidatus Pelagibacter sp. HTCC7211 | G | 251 | 207082844 | a |
| Rba1 | Rhodobacterales bacterium HTCC2255 | J | 327 | 114770327 | a |
| Sen1 | Salmonella enterica subsp. arizonae serovar 62:z4,z23:-- | B | 460 | 161503120 | g |
| Sen2 | Salmonella enterica subsp. arizonae serovar 62:z4,z23:-- | D | 660 | 161503245 | g |
| Sen3 | Salmonella enterica subsp. arizonae serovar 62:z4,z23:-- | S | 1812 | 161505715 | g |
| Sgl1 | Sodalis glossinidius str. 'morsitans' | P | 934 | 85058580 | g |
| Spr1 | Serratia proteamaculans 568 | B | 497 | 157371141 | g |
| Ssp1 | Synechococcus sp. RCC307 | E | 428 | 148243547 | Cyanobacteria |
| Ssp2 | Synechococcus sp. RCC307 | E | 436 | 148241686 | Cyanobacteria |
| Sty4 | Salmonella typhi | W | 626 | 7644406 | g |
| Ybe1 | Yersinia bercovieri ATCC 43970 | R | 945 | 77959044 | g |
| Yen2 | Yersinia enterocolitica subsp. enterocolitica 8081 | N | 2484 | 123441053 | g |
| Yfr1 | Yersinia frederiksenii ATCC 33641 | Q | 770 | 77972786 | g |
| Yfr2 | Yersinia frederiksenii ATCC 33641 | Q | 906 | 77974284 | g |
| Yfr3 | Yersinia frederiksenii ATCC 33641 | Q | 851 | 77971991 | g |
| Yfr4 | Yersinia frederiksenii ATCC 33641 | A | 749 | 77974432 | g |
| Yfr5 | Yersinia frederiksenii ATCC 33641 | Q | 780 | 77972649 | g |
| Yin1 | Yersinia intermedia ATCC 29909 | A | 751 | 77979954 | g |
| Yin2 | Yersinia intermedia ATCC 29909 | A | 753 | 77977839 | g |
| Ymo1 | Yersinia mollaretii ATCC 43969 | N | 1424 | 77962119 | g |
| Ymo2 | Yersinia mollaretii ATCC 43969 | A | 686 | 77963537 | g |
| Ype5 | Yersinia pestis KIM | R | 1050 | 22126485 | g |
| Yps2 | Yersinia pseudotuberculosis | Q | 985 | 155441 | g |
| Yps4 | Yersinia pseudotuberculosis YPIII | Q | 5337 | 170022406 | g |
| Yps7 | Yersinia pseudotuberculosis | Q | 1486 | 218534673 | g |