- ILK
- ILKAP
- ILP-2
- Ilrun
- ILTIFB
- ILVBL
- IMMP1L
- IMMP2L
- IMMT
- IMP3
- IMP4
- IMPA1
- IMPA2
- IMPACT
- IMPAD1
- IMPDH1
- IMPDH2
- IMPG1
- IMPG2
- Importin 11
- Importin 4
- Importin 5
- Importin 8
- Importin 9
- IN80D
- INA
- INCA1
- INCENP
- Indian Hedgehog
- INE1
- INF2
- Influenza A H1N1 PB1
- Influenza A Virus Matrix Protein 1
- Influenza A Virus Neuraminidase
- Influenza Polymerase Acidic
- Influenza Polymerase Basic 2
- ING1
- ING2
- ING3
- ING4
- ING5
- INHBA
- INHBB
- INHBC
- INHBE
- Inhibin alpha
- INIP
- INMT
- INO80
- INO80B
- INO80C
- INO80E
- INPP1
- INPP4A
- INPP4B
- INPP5A
- INPP5B
- INPP5D
- INPP5E
- INPP5F
- INPP5J
- INPP5K
- INPPL1
- INS-IGF2
- INSC
- INSIG1
- INSIG2
- INSL3
- INSL4
- INSL5
- INSL6
- INSM1
- INSM2
- INSRR
- Insulin
- Insulin Receptor
- Insyn1
- Integrin alpha 1
- Integrin Alpha2b
- Integrin beta 2
- Integrin beta 3
- Integrin beta 4
- Integrin beta 5
- Integrin beta 7
- Intelectin B
- Interferon gamma
- Interferon zeta
- Interleukin 17a
- Intersectin 2
- Intestinal Alkaline Phosphatase
- Intrinsic Factor
- INTS1
- INTS10
- INTS12
- INTS2
- INTS3
- INTS4
- INTS4L1
- INTS5
- INTS6