  We discuss recent CTEQ-TEA group activities after the publication of the CT18
global analysis of parton distribution functions (PDFs) in the proton. In
particular, we discuss a new calculation for the photon content in the proton,
termed as CT18lux and CT18qed PDFs, and the impact of novel charm- and
bottom-quark production cross section measurements at HERA on the CT18 global
analysis.
