Figure 1

Architecture of ZP-N-containing proteins. The primary sequence of each protein is shown as a grey bar, drawn to scale and with the amino and carboxy termini marked. Signal peptides (as identified by SignalP) and transmembrane domains (as predicted by SMART) are represented by red and blue rectangles, respectively; ZP-N sequences are shown as pink rectangles and a trefoil (P) domain is depicted as a yellow rhombus. Proteins are in the same order as in Table 1 and identified by their accession number.