_Secondary_struct.Seq_ID_start
| Description | Sequence number for the first chemical component in the structure element. Pointer to '_Entity_poly_seq.Num' |
| Details: | |
| Parent saveframe | secondary_structs |
| Data type | int |
| DB table | Secondary_struct |
| DB column | Seq_ID_start |
| DB type | INTEGER |
| NULL allowed | no (mandatory) |