1. Ribozymes remain as the main components of ribosomes, modern cells' "protein factories."

2. Ribozymes are small catalytic RNA, which could cleave the target gene and block its expression.

3. The object of the invention is to allow the production of optimum ribozymes for any desired target sequence.

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5. The conjugated medicinal agent of the present invention has the following formula (I): P-(S)x-Gal-GA-R, wherein in the P-(S)x-moiety, P is a peptide residue of a human serum glycoprotein and S is a sugar residue of a human serum glycoprotein; Gal is galactose residue; GA is glutaraldehyde residue; x is an integer equal to or greater than 1; and R is a medicinal component selected from the group consisting of interferon, acyclovir sodium, ribavirin, vidarabine, zidovudine, suramin, anti-sense oligonucleotide, ribozyme, leucovorin calcium, sodium-meglumine diatrizoate, gadolinium-DTPA, glutathione (GSH), prostaglandins, ?