English to Russian Science Chemistry; Chem Sci/Eng

In certain cases it may, however, be desirable to include a portion of a non-naturally-occurring lipid in components i) and/or ii).

This might be, for example an "ether lipid" in which the head and tail groups are joined by an ether bond rather than an ester. Such non- naturally-occurring lipids may be used, for example, to alter the rate of degradation of the resulting depot-composition by having a greater or lesser solubility or vulnerability to breakdown mechanisms present at the site of active agent release.

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