In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.

Q:  In our study , although distance from the Khimprom plants was a weak predictor of serum dioxin - like compounds , consumption of local foods ( specifically meat and fish ) , as in the Seveso study , was a strong predictor of sum of dioxin - like compounds and dioxin TEQs .

A: serum
****
Q:  Therefore , when CoNS or Streptococcus spp . were detected by blood culture and SeptiFast analysis , the following criteria were applied to define whether these strains represented a pathogenic infection : ( 1 ) Tests were performed at least twice within 48 hours before and after CoNS were detected by blood culture or SeptiFast analysis ; ( 2 ) CoNS or Streptococcus spp . were detected in two different blood culture tests that were separately performed twice within 48 hours ; and , ( 3 ) CoNS or Streptococcus spp . were detected twice or more in tests that were performed three times [ 11 - 15 ] .

A: blood
****
Q:  Colorimetrical rate assay for urinary dipeptidyl peptidase IV ( DPPIV ) activity using a new substrate .

A:
urinary
****