Experimental validation of signal peptides in the Candidatus Kuenenia stuttgartiensis proteins. Identification of cleavage sites from seven Candidatus Kuenenia stuttgartiensis mature proteins. The peptides that were identified in the tryptic digest are coloured red; their N-terminal sides were non-tryptic. Underlined sequences represent the putative signal peptides, and the putative SPase 1 recognition sites adjacent to the non-tryptic side of the peptides are printed in bold. The left column indicates whether the protein is present in either the A or the P training set.