| http://www.w3.org/ns/prov#value | - or ##STR6## wherein p is an integer from 1 to 5, q is an integer from 0 to 4, and R4 is H or a C1 to C4 alkyl, and each of m, n and o is an integer from 0 to 8, with the provisos that m???1 and (m+n+o)???3, and wherein said thiocationic lipid facilitates the entry of at least one said optionally modified oligonucleotide into a cell in vitro. 2.
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