Organism scope        Eukaryotes and eukaryotic viruses

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Feature Key           precursor_RNA

Definition            任何还不是成熟RNA产物的RNA形式，可以包括5'clip,5'UTR,CDS,exon,intron,3'UTR和3'clip

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

Comment              可以是后转录加工RNA形式，如果对RNA是否被加工存在疑问，可用prim_transcript关键词代替

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Feature Key           prim_transcript

Definition            最初的，未经过加工的转录子；包括5'clip,5'UTR,CDS,exon,intorn,3'UTR，3'clip

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

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Feature Key           primer_bind

Definition           复制、转录和逆转录起始位点的非共价引物结合位点。包括合成的位点，例如PCR引物结合位点

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

Comment               这个关键词用来注明此位点是在某段引物分子可结合的序列上，而不是指引物分子本身。PCR成分和反应时间可写在/PCR_conditions qualifiers 中由于ＰＣＲ反应通常包括引物对，单个 primer_bind关键词可用order()中的两个位置表示，或者用一对primer_bind表示。

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Feature Key           promoter

Definition            包括ＲＮＡ酶结合位点到起始转录位点的在ＤＮＡ分子上的区域

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

                      /standard_name="text"
                      /usedin=accnum:feature_label

Molecule scope        DNA

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Feature Key           protein_bind

Definition           在核酸上的非共价蛋白结合位点 

Mandatory qualifiers  /bound_moiety="text"

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