Gnus color highlighting

[cothrige]

I recently started using Gnus for news reading, switching from slrn, and
have been rather pleased.  However, one thing which I have found to be
odd, and haven't been able to sort out with searches, is the color
highlighting in the article buffer.  If there is a quoted line it will
be a different color than the normal text, as one would expect.  But,
only if it begins with exactly one '>'.  If there are more than that,
then there is no syntax highlighting at all.

Personally, I would like to have all the lines beginning with '>' to be
highlighted, such as other readers would do.  How can this be
accomplished?  I am certain that I am simply overlooking something
obvious, but after plowing through page after page on google, I am ready
to seek advice.

Many thanks,

Patrick