| loops of spinal nerves | Loops of the spinal nerves, connecting ventral primary rami of the spinal nerves. Synonym: ansae nervorum spinalium. (05 Mar 2000) |
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| capillary loops | Small blood vessels in the dermal papillae. (05 Mar 2000) |
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| cruciform loops | A secondary structure of DNA formed by the hydrogen bonding of self-complementary regions. (05 Mar 2000) |
| hairpin loops | Single-stranded DNA and RNA can fold back on itself under the proper conditions forming irregular double-helical loops. (05 Mar 2000) |