[R] string handling

[karena]

I have a data.frame as the following:
var1        var2
9G/G09    abd89C/T90
10A/T9    32C/C
90G/G      A/A
.             .
.             .
.             .
10T/C      00G/G90

What I want is to get the letters which are on the left and right of '/'. 
for example, for "9G/G09", I only want "G", "G", and for "abd89C/T90", I
only want "C" and "T", how to get these?

thank you,

karena
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