[R] concatenating 2 text columns in a data.frame

[Shaun Grannis]

Hi,

I'm trying to concatenate values from two columns in a data frame. For 
example, I have the following data.frame:

C1  C2  C3  C4  C5
 A   B   *F   C*   Q
 G   H   *I   J*   T
 K   D   *R   S*   E
 P   L   *M   N*   O

I'd like to concatenate text from columns C3 and C4, to yield either a 
list or vector, like so:

NewCol
  FC
  IJ
  RS
  MN

Is this feasible in R?

Thanks!