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| PR:Q13639 | 5-hydroxytryptamine receptor 4 (human) | | |  | | |
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| PR:Q13639-2 | 5-hydroxytryptamine receptor 4 isoform 5-HT4(A) (human) | | |  | | |
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| PR:Q13639-1 | 5-hydroxytryptamine receptor 4 isoform 5-HT4(B) (human) | | |  | | |
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| PR:Q13639-3 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(C) (human) | | |  | | |
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| PR:Q13639-4 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(D) (human) | | |  | | |
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| PR:Q13639-5 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(E) (human) | | |  | | |
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| PR:Q13639-6 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(F) (human) | | |  | | |
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| PR:Q13639-7 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(G) (human) | | |  | | |
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| PR:Q13639-8 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(I) (human) | | |  | | |
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| PR:Q13639-9 | 5-hydroxytryptamine receptor 4 isoform h5-HT4c1 (human) | | |  | | |
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| PR:Q13639 | 5-hydroxytryptamine receptor 4 (human) | | |  | | |
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| PR:Q13639-2 | 5-hydroxytryptamine receptor 4 isoform 5-HT4(A) (human) | | |  | | |
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| PR:Q13639-1 | 5-hydroxytryptamine receptor 4 isoform 5-HT4(B) (human) | | |  | | |
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| PR:Q13639-3 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(C) (human) | | |  | | |
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| PR:Q13639-4 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(D) (human) | | |  | | |
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| PR:Q13639-5 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(E) (human) | | |  | | |
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| PR:Q13639-6 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(F) (human) | | |  | | |
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| PR:Q13639-7 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(G) (human) | | |  | | |
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| PR:Q13639-8 | 5-hydroxytryptamine receptor 4 isoform h5-HT4(I) (human) | | |  | | |
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| PR:Q13639-9 | 5-hydroxytryptamine receptor 4 isoform h5-HT4c1 (human) | | |  | | |