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.

Ex Input:
 In one of the few studies on dioxin - like compounds in which children were included , Eskenazi and coworkers [ 36 ] evaluated the relationship between serum TCDD concentrations and age at exposure of female residents of Seveso , Italy .

Ex Output:
serum


Ex Input:
 As expected , serum PCBs , specifically PCB 118 , were strongly associated with both sum of dioxin - like compounds and sum of dioxin TEQs .

Ex Output:
serum


Ex Input:
 The agonism of 5 - HT1A receptors , negatively coupled to cAMP , reduces IOP by decreasing the production of aqueous humor , like beta - receptor antagonists which , diminishing the content of cAMP at the postjunctional site , lowers the aqueous humor secretion with a consequent decrease in IOP [ 98 ] .

Ex Output:

humor