The multi-copy ribosomal P proteins have been identified on the riboso
mes of prokaryotic and eukaryotic cells, and their antigenicity is an
important feature of human Trypanosoma cruzi infection. In this review
, Mariano Levin, Martin Vazquez, Dan Kaplan and Alejandro Schijman giv
e a rational basis for the classification of these proteins, and discu
ss their inter-relationship.