A method of enhancing or inducing the expression of the HLA-G molecule by human cells is provided. The method includes administering the human Herpesvirus 6 U94 molecule or a derivative thereof, or a gene expression vector including and expressing the human Herpesvirus 6 U94 gene to a patient in need thereof or to an in vitro cell, tissue, or organ culture.

The present invention relates to a peptide of length equal to or less than 5 amino acids, or a derivative thereof, comprising the sequence DKY, preferably XDKY (SEQ ID No. 7) or DKYX (SEQ ID No. 8), or the sequence DRY, preferably XDRY (SEQ ID No. 9) or DRYX (SEQ ID No. 10), where X is any amino acid, for use as a drug, particularly for use in the treatment of a disorder resulting from pathological angiogenesis, and a pharmaceutical composition comprising it together with at least one pharmaceutically acceptable excipient.