Lna oligonucleotides with alternating flanks

An oligomer of at least 10 contiguous nucleotides in length, comprising region A, region B, and region C (A-B-C),

• wherein region B comprises at least 5 consecutive nucleoside units and is flanked at 5′ by region A of 1-8 contiguous nucleoside units and at 3′ by region C of 1-8 contiguous nucleoside units, wherein region B, when formed in a duplex with a complementary RNA, is capable of recruiting RNaseH, and
• wherein region A and region C are selected from the group consisting of:
• (i) region A comprises a 5′ LNA nucleoside unit and a 3′ LNA nucleoside unit, and at least one DNA nucleoside unit between the 5′ LNA nucleoside unit and the 3′ LNA nucleoside unit, and, region C comprises at least two 3′ LNA nucleosides;
• or
• (ii) region A comprises at least one 5′ LNA nucleoside and region C comprises a 5′ LNA nucleoside unit, at least two terminal 3′ LNA nucleoside units, and at least one DNA nucleoside unit between the 5′ LNA nucleoside unit and the 3′ LNA nucleoside units, and
• (iii) region A comprises a 5′ LNA nucleoside unit and a 3′ LNA nucleoside unit, and at least one DNA nucleoside unit between the 5′ LNA nucleoside unit and the 3′ LNA nucleoside unit;
• and region C comprises a 5′ LNA nucleoside unit, at least two terminal 3′ LNA nucleoside units, and at least one DNA nucleoside unit between the 5′ LNA nucleoside unit and the 3′ LNA nucleoside units.