Proteome analysis of Bacillus subtilis extracellular proteins: a two-dimensional protein electrophoretic study The SWISS-PROT accession numbers for the N-terminal amino acid sequences reported in this paper are: P00691 for AmyE; P54507 for CotN; O07921 for Csn; P09124 for Gap; P26901 for KatA; P39116 for Pel; P39824 for PenP; P54375 for SodA; P29141 for Vpr; Q07833 for WapA; P54423 for WprA; P54327 for XkdG; Q45071 for XynD; P94421 for YclQ; O31803 for YcnM; O05512 for YdhT; O34952 for YflE; O06487 for YfnI; O31737 for YlqB; P96740 for YwtD; P42110 for YxaK; P94356 for YxkC.