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

A: serum
****
Q:  Plasma from 182 patients with different malignant diseases was tested for riboflavin binding by immunoglobulins , which have been recently identified as major carriers of this micronutrient .

A: Plasma
****
Q:  It was concluded that when the MLP - NN is used within the range studied , the optimized NN is able to estimate the beta - carotene and lycopene concentrations in food samples with an adequate accuracy , solving the UV - vis interference of beta - carotene and lycopene .

A:
samples
****
