The Total Number CASRN in use category reflects the sum of CASRN in each category. The values before the arrow represent the number of CASRN in each use category when merging the inventories from the multiple sources contributing to the use category. The values after the arrow represent the unique number of CASRN in each use category after chemicals were assigned to only one use category, and all duplicates were removed. For chemicals appearing in more than one use category preference was given to classification as a Direct Food Additive > Food Contact Substance > Pesticide. The subsequent columns (“Number of CASRN with Defined Fingerprints” and the “Number of CASRN in ToxCast” are subsets from the final value after the arrow in brackets.