A lack of precise, high resolution testing in the past makes it difficult to discuss F*, F1, F2* and F3* separately. ISOGG states that F(xG,H,I,J,K) has not been well studied, occurs "infrequently" in modern populations and peaks in South Asia, especially Sri Lanka. It also appears to have long been present in South East Asia. However, the possibility of misidentification is considered to be relatively high and some cases may in fact belong to misidentified subclades of Haplogroup GHIJK. This was, for instance, the case with the subclade Haplogroup H2 (P96), which was originally named "F3", i.e – a name that has since been reassigned to F-M481.