- S
- SST
- Structural protein
- SPA
- SERTAD
- STRC
- SETX
- SCT
- SDPR
- SPON2
- S-arrestin
- SESN2
- SEZ6
- SHH
- Signal transduction
- SNAPA
- STXBP1
- SLFN12L
- SLP-3
- SPG11
- SSPN
- SURF1
- SOX
- STAT
- SPI1
- Sec61
- SERP1
- SERPIN
- SLPI
- SPINT
- SAH
- SARM1
- SGSH
- SOD
- SQOR
- SAMS
- SHMT
- SPDS
- SQS
- Streptococcus exotoxin
- SUB1
- Subtilisin
- SecA
- SAA
- SAP
- SIGLEC
- SELE
- SELL
- SELP
- SH3BP2
- SMAC
- SETBP1
- SMC
- SNRPN
- SNRNP200
- SNRNP70
- SF-1R
- Steroid hormone receptor
- SPARC
- SYPL
- SLIT1
- SLIT2
- SLIT3
- Selenoprotein
- SEMA
- SFTPB
- SMOC1
- SOST
- SPRX2
- SET
- SYNGAP1
- SFRP1
- SFRP2
- SFRP4
- SH2D
- SHC
- SMAD
- SQSTM1
- STX
- SOCS
- SGC
- SPN
- SHOC2
- SIRP
- SLITRK2
- SLITRK6
- SP-B
- SP-D
- SYN3
- SYP
- SYT2
- SCAP
- SMN
- Splicing factor
- SRSF1
- SHANK3
- SPRR1B
- SCX
- SPDEF
- SIX1
- SRF