update the given paragraph to be more coherent
Research has also been directed towards studying the surface chemistry of these arrays to determine which surface chemistries control cell adhesion. Concerns have been raised as to the influence of the substrate on measurements and the questionable statistical interpretation of results.
Research has also been directed towards studying the surface chemistry of these arrays to determine which surface chemistries control cell adhesion, although concerns have been raised as to the influence of the substrate on measurements and the questionable statistical interpretation of results.