Résumé : Two genes encoding rat cystatin-related prostate protein (Cstrp), previously called CRP (Devos et al., 1993), were mapped to chromosome 3q41 by fluorescent in situ hybridization. The results were confirmed using a panel of mouse-rat hybrids that segregate rat chromosomes. Analysis of genomic DNA indicates that the Cstrp locus comprises probably more than three very similar genes.