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 a 1 . 5 ml microcentrifuge tube , plasmid ( 1 microg / microl ) and siRNA were mixed with growth medium without fetal calf serum ( FCS ) , 0 . 5 microl 1 . 5 M sucrose and 3 microl X - tremeGENE per microgram nucleic acid to a final volume of 22 . 5 microl .

A: serum
****
Q:  Immunoglobulins associated with elevated riboflavin binding by plasma from cancer patients .

A: plasma
****
Q:  Data from this study suggest that there may be a time - dependent relationship between dexamethasone immunosuppression and the fecal concentration of E . coli O157 but that transient immunosuppression does not appear to prolong shedding of E . coli O157 .

A:
fecal
****