[R] help with expression()

[deanj2k]

Hello.
I have a vector and within that vector is one expression.  When I display
this vector it comes up as 

expression(NA_character_, NA_character_, "Null Effect", "Pooled effect", 
    NA_character_, NA_character_, NA_character_, NA_character_, 
    NA_character_, paste("Het Contours ", I^2, sep = ""), 0.4, 
    0.41, 0.42, 0.45, NA_character_)

Where the part in bold is the element which is an expression.  How do I
change this vector to a standard format what I can manipulate in the usual
way?
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