Detailed analysis of other taxonomic groups may, however, indicate important anatomical differences. Rose (2002) argues that because fish lack an ACC they may not be bothered by pain.  This is in contrast to Sneddon et al. (2003) who argue that there is adequate behavioral and physiological evidence to support pain attributions to fish.  (See, also, Chandroo et al. 2004 for a review.)  While the ACC is important to mammals, there remains the possibility that other taxa may have functionally similar structures, such as the corticoidea dorsolateralis in birds (Atoji &amp; Wild 2005; Dubbeldam 2009). Genetic knockout animals are also providing further clues about the affective aspects of pain (see Shriver 2009 for a review and application of these findings to animal welfare.)