This journal provides immediate access to some articles. Volume 266(1414); January 7, 1999 Inbreeding, heterozygote advantage and the evolution of neo-X and neo-Y sex chromosomes PMCID: PMC1689647 Phylogenetic analysis of Euthyneura (Gastropoda) by means of the 16S rRNA gene: use of a 'fast' gene for 'higher-level' phylogenies PMCID: PMC1689638 | ||