[R] Combining Overlapping Data

[kickout]

I've scoured the archives but have found no concrete answer to my question.

Problem: Two data sets

1st data set(x) = 20,000 rows 
2nd data set(y) = 5,000 rows

Both have the same column names, the column of interest to me is a variable
called strain.

For example, a strain named "Chab1405" appears in x 150 times and in y 25
times...
strain "Chab1999" only appears 200 times in x and none in y (so i dont want
that retained).


I want to create a new data frame that has all 175 measurements for
"Chab1405" and any other 'strain' that appears in both the two data sets..
but not strains that appear in only one data set...So i want the
intersection of two data sets (maybe?).

I've tried x %in% y, but that only gives TRUE/FALSE


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