Although recent studies have improved our knowledge of chromosome 9 variants, there are still gaps and controversial issues. In particular, the classifications of 9qh polymorphic inversions proposed in two similar and almost simultaneous papers by Verma and co-workers (Ramesh and Verma 1996; Samonte et al. 1996) are confusing and contradictory.División de Genética, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco, Mexico.