What is the definition of these words

__________________ are small proteins produced by cells infected with a virus, and sometimes can be used in viral treatment.

What does "long form" mean when reffering to medical terminology?

A couple decide to have a child. They require and select a suitable sperm donor who they understand to be blood group AB and rhesus +ve. The carrier of the baby is blood group A and rhesus –ve. However, when the baby is born, they discover that the baby’s blood group is O rhesus +ve. Worried that there has been a mistake they ask for a DNA test, which confirms the sperm used was indeed that of the donor. Further DNA analysis of the carrier of the baby shows that she has isoagglutinogen alleles IA iO, while the baby is actually IB and IO.      How would you explain the outcome of the blood group to the couple? What is the chance that any other children will be blood group O using the same sperm donor?    What further medical considerations should the couple consider for this child and additionally for any other subsequent pregnancies?