The structure designated by the letter "A" in

the above figure is called
a. pyloric sphincter.
b. esophagus.
c. mucosa.
d. duodenum.
e. none of these.


B

Biology & Microbiology

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________ are a group of cytokines produced by some eukaryotic cells in response to a viral infection.

Fill in the blank(s) with the appropriate word(s).

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