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| Number | Title | Issue Date |
| 5891840 | Stabilization of somatotropins by modification of cysteine residues utilizing site directed mutagenesis Novel modified or derivatized recombinant animal somatotropins. Methods for stabilizing recombinant animal somatotropins by modification or deletion of the Cysteine residues utilizing site directed mutagenesis to replace from one to four of the cysteine a... | 04/06/1999 |