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.

 Archived serum collected near the time of the accident was used to measure exposures .
serum

 The actin - regulatory protein gelsolin is found both intracellularly and in plasma [ 147 , 148 ] .
plasma

 To investigate the potential role of sympathetic nerves in preventing pronounced increases in cerebral blood flow , we evaluated the effects of abrupt hypertension on the cerebral circulation of newborn pigs with intact cerebral sympathetic innervation and after cerebral sympathetic denervation .

blood