Daenerys Targaryen was introduced in A Feast for Crows.
Human teratocarcinoma-derived virus -LRB- HDTV -RRB- , also called Human endogenous retrovirus K -LRB- HERV-K -RRB- , is a human endogenous retrovirus .. Human endogenous retrovirus K. Human endogenous retrovirus K. human endogenous retrovirus. human endogenous retrovirus