R1E1T1R1O1V4I1R1U1S1E1S1
15 points
RETROVIRUSES is validvalid
RETROVIRUS, a virus made of RNA instead of DNA [n]
RETROVIRUS, any of a group of viruses whose genetic material is encoded in the form of RNA rather than DNA [n]
RETROVIRUS, a virus made of RNA instead of DNA [n]
RETROVIRUS, any of a group of viruses whose genetic material is encoded in the form of RNA rather than DNA [n]