Off topic:Extracting rows based on specific string in a column

Question

[jivarajivaraj]

Hi,

I have this file

> head(dat)
          GENE              ID        Gene products
1 DDB_G0267364         Skipper     GAG-PRO         
2 DDB_G0267372          TRE5-A        ORF1         
3 DDB_G0267380 acetylornithine deacetylase         
4 DDB_G0267304           DIRS1        ORF3 fragment
5 DDB_G0267338           DIRS1        putative myb transcription factor         
6 DDB_G0267356         Skipper GAG-PRO-POL         
>

I want to extract genes in GENE column that have "transcription factor" in products column in R. How can I do that please?