sentences:  Claim 13 is a diagnostic method for detecting deficiencies of vitamins B6 and B12 that relies on the correlation of that condition with elevated levels of homocysteine.The claim instructs medical providers to test homocysteine levels in a patient, without specifying any specific means of doing so, and make logical inferences based on the test results and aware of the discovered correlation between elevated levels and vitamin deficiencies.A jury found the defendants liable for indirect infringement of claim 13 and breach of contract.