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Feature key definitions - alphabetical

Feature Key           attenuator

Definition            1) 一段可控制某些细菌操纵子表达的DNA序列，转录的终止在此发生                     
                             2) 定位在启动子与第一个结构基因之间，可引起部分的转录终止              

Optional qualifiers   /citation=[number]
                      /db_xref="<database>:<identifier>"
                      /evidence=<evidence_value>
                      /gene="text"
                      /label=feature_label
                      /map="text"
                      /note="text"
                      /partial
                      /phenotype="text"
                      /usedin=accnum:feature_label

Organism scope        prokaryotes

Molecule scope        DNA

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Feature Key           C_region

Definition            免疫球蛋白轻链和重链，以及T细胞受体α、β、γ链的恒定区。依据特定的链可能包含一个或更多的外显子。
       
Optional qualifiers   /citation=[number]

                      /db_xref="<database>:<identifier>"
                      /evidence=<evidence_value>
                      /gene="text"
                      /label=feature_label
                      /map="text"
                      /note="text"
                      /partial
                      /product="text"
                      /pseudo
                      /standard_name="text"
                      /usedin=accnum:feature_label

Parent Key            CDS

Organism scope        Eukaryotes

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Feature Key           CAAT_signal

Definition           CAAT框，定位在真核生物转录起始位点上游75bp的一段保守序列，此转录单位可被包括在RNA聚合酶结合位点内。一致序列=GG（C/G)CAATCT[1,2]

Optional qualifiers   /citation=[number]
                      /db_xref="<database>:<identifier>"                     
                      /evidence=<evidence_value>
                      /gene="text"
                      /label=feature_label
                      /map="text"
                      /note="text"
                      /partial
                      /usedin=accnum:feature_label

Organism scope        Eukaryotes and eukaryotic viruses

Molecule scope        DNA

References            [1]  Efstratiadis, A.  et al.  Cell 21, 653-668 (1980)
                               [2]  Nevins, J.R.  "The pathway of eukaryotic mRNA formation"  Ann Rev Biochem 52, 441-466 (1983)

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Feature Key           CDS

Definition           编码序列；此段序列相对应于蛋白上的氨基酸序列（包括终止密码子），特征包括氨基酸翻译

Optional qualifiers   /citation=[number]
                      /codon=(seq:"text",aa:<amino_acid>)
                      /codon_start=<1 or 2 or 3>
                      /db_xref="<database>:<identifier>"                     
                      /EC_number="text"
                      /evidence=<evidence_value>
                      /exception="text"
                      /function="text"
                      /gene="text"
                      /label=feature_label
                      /map="text"
                      /note="text"
                      /number=unquoted text (single token)
                      /partial
                      /product="text"
                      /protein_id="<identifier>"
                      /pseudo
                      /standard_name="text"
                      /translation="text"
                      /transl_except=(pos:<base_range>,aa:<amino_acid>)
                      /transl_table =<integer>
                      /usedin=accnum:feature_label