NOTE.-Standardized residuals of adjusted egg counts were used as the quantitative phenotype. Genotypes were determined with an automated sequencer (model 373A; Applied Biosystems) and the GENOTYPER software. a Based on the data from the study by Marquet et al.(1996) and on the comprehensive human linkage map (Cooperative Human Linkage Center 1994). The position of CSF1R was chosen as the origin, in accordance with the study by Marquet et al.(1996). b The WPC statistic based on Qrdinary residuals and permutation inference. The WPC-OP score, like the Z score, follows a standard normal distribution (Commenges 1994; Commenges et al. 1994; Coin-menges and Abel 1996).