| id | String | No description |
| extension | [Extension] | No description |
| modifierExtension | [Extension] | No description |
| subunit | Int | No description |
| _subunit | ElementBase | No description |
| sequence | String | No description |
| _sequence | ElementBase | No description |
| length | Int | No description |
| _length | ElementBase | No description |
| sequenceAttachment | Attachment | No description |
| fivePrime | CodeableConcept | No description |
| threePrime | CodeableConcept | No description |
| linkage | [SubstanceNucleicAcidSubunitLinkage] | No description |
| sugar | [SubstanceNucleicAcidSubunitSugar] | No description |