I've seen quite a few protocols utilizing HEK293X cells for the expression of human proteins with complex PTMs, are there any other cell lines that can be transfected with inducible expression vectors without much trouble?
Also, I've noticed that many research labs and biopharma have been using CHO cells to generate IgG/IgM antibodies. The newer research seems to suggest that these glycan structures are not ideal for humans and many of these antibodies are being modified post-expression to alter the terminal ends of the glycan structures.