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The CROSS_TEST database accumulates the procedures adapting a sequence-activity relationship from one measurement system to another. The database integrates both ACTIVITY and relevant database entries by cross-testing the KNOWLEDGE-documented computational procedure on independent data.

Each CROSS-TEST entry has 12 fields: MI, identifier; MN, name; WW, Web-resource; DR, database; MD, adaptation procedure; AB, sequence region; LC, linear correlation coefficient; XI, c ²-coefficient of the site/Random DNA discrimination; ST, means, standard deviation, false negatives; NT, means, standard deviation, false positives; AL, significance a ; C-, computational procedure adapting the sequence-activity relationship from one measurement system to another. Each entry gives the statistical reasoning why one system could be adaptive to another (LC, XI, ST, NT, and AL). Within these statistical limits, one may adapt computational procedures by implementing a C-coded program (C-). To provide the query for the measurement system cross-test results, there are two keyword descriptor fields (AB and MD).