removing repeated rows in a text file in R

Question

I have a dataset like the following example:

0.0081967213    GCLC
0.0081967213    GCLC
0.0115273775    NFYA
0.0115273775    NFYA
0.0348432056    STPG1
0.0348432056    STPG1
0.0348432056    STPG1

and I would like to make a new file like this:

0.0081967213    GCLC
0.0115273775    NFYA
0.0348432056    STPG1

meaning I would like to have one repeat of each line. I actually tried

data <- read.table("file.txt", sep=",")
 data2 <- unique(data)

but did not return what I wanted. do you know to make such file?