Small-caps in R legend?

This is a simple question.

I am trying to write a legend with text in small caps in R.

I can write the plot using tikzDevice and manually change the plot to small-caps in LaTex, but I want to know if it's possible in R itself?

Thanks.

This is the R code I am using so far:

legend("bottomright", inset=.05, c(expression(Delta*ZRT1), expression(Delta*ZRT2)), lty=1:2, pch=1:2)

This is the LaTex expression I am trying to get into the R legend:

\Delta Z\textsc{rt\oldstylenums{1}}

The Unicode standard does define a number of "small capital" characters in the IPA extensions. E.g., using this Smallcaps Generator: http://fsymbols.com/generators/smallcaps/

plot(1L:10, main="Aʙᴄᴅᴇғɢʜɪᴊᴋʟᴍɴᴏᴘǫʀsᴛᴜᴠᴡxʏᴢ")
legend("bottomright", expression(\Delta Zʀᴛ1")

As of Unicode 5.1, the only characters missing to allow representation of the full Latin alphabet in small capital Unicode characters are small capital versions of Q and X. See also here: http://en.wikipedia.org/wiki/Small_caps#Unicode