| SF3B3 | H. sapiens | 17S U2 snRNP | KIAA0017, RSE1, SAP130, SF3b130, STAF130 | 135.6 | 19 |
| SF3B1 | H. sapiens | 17S U2 snRNP | Hsh155, MDS, PRP10, PRPF10, SAP155 | 145.8 | 18 |
| NCBP1 | H. sapiens | pre-mRNA/mRNA binding proteins | CBP80, MGC2087, NCBP, Sto1 | 91.8 | 12 |
| CCAR1 | H. sapiens | Recruited at A complex | MGC44628, RP11-437A18.1 | 132.8 | 12 |
| DDX46 | H. sapiens | 17S U2 snRNP associated | FLJ25329, KIAA0801, MGC9936, PRPF5, Prp5 | 117.4 | 11 |
| DHX15 | H. sapiens | 17S U2 snRNP associated | DBP1, DDX15, HRH2, PRP43, PRPF43 | 90.9 | 11 |
| HNRNPD | H. sapiens | hnRNP | AUF1, AUF1A, HNRPD, P37, hnRNPD0 | 38.4 | 10 |
| SF3A1 | H. sapiens | 17S U2 snRNP | PRP21, PRPF21, SAP114, SF3A120 | 88.9 | 10 |
| PUF60 | H. sapiens | 17S U2 snRNP associated | FIR, FLJ31379, RoBPI, SIAHBP1 | 59.9 | 10 |
| ACLY | H. sapiens | | ACL, ATPCL, CLATP | 120.8 | 9 |
| GAPDH | H. sapiens | | G3PD, GAPD, MGC88685 | 36.1 | 9 |
| SRRT | H. sapiens | pre-mRNA/mRNA binding proteins | ARS2, ASR2, MGC126427, serrate | 100.7 | 8 |
| SF3B2 | H. sapiens | 17S U2 snRNP | Cus1, SAP145, SF3B145, SF3b1, SF3b150 | 100.2 | 8 |
| U2AF2 | H. sapiens | 17S U2 snRNP associated | U2AF65 | 53.5 | 8 |
| CSDA | H. sapiens | | CSDA1, DBPA, ZONAB | 40.1 | 7 |
| LUC7L3 | H. sapiens | | CRA, CREAP-1, CROP, LUC7A, OA48-18 | 51.5 | 7 |
| TUBB6 | H. sapiens | common MS contaminants | HsT1601, MGC132410, MGC4083, TUBB-5 | 49.9 | 6 |
| U2AF1 | H. sapiens | 17S U2 snRNP associated | DKFZp313J1712, FP793, RN, RNU2AF1, U2AF35 | 27.9 | 6 |
| SNRPB | H. sapiens | Sm | COD, SNRPB1, Sm-B/B', SmB/B', SmB/SmB' | 24.6 | 6 |
| MAP1B | H. sapiens | | DKFZp686E1099, DKFZp686F1345, FLJ38954, FUTSCH, MAP5 | 270.6 | 6 |
| HNRNPU | H. sapiens | hnRNP | HNRPU, SAF-A, U21.1, hnRNP U | 90.6 | 5 |
| HNRNPA1 | H. sapiens | hnRNP | HNRPA1, HNRPA1L3, MGC102835, hnRNP A1, hnRNP-A1 | 38.7 | 5 |
| FUS | H. sapiens | hnRNP | ALS6, FUS1, HNRNPP2, POMP75, TLS | 53.4 | 5 |
| SNRPC | H. sapiens | U1 snRNP | FLJ20302, U1C, Yhc1 | 17.4 | 5 |
| SNRPE | H. sapiens | Sm | B-raf, SME, Sm-E | 10.8 | 5 |
| RBM17 | H. sapiens | 17S U2 snRNP associated | DKFZp686F13131, MGC14439, SPF45 | 45.0 | 4 |
| SNRNP70 | H. sapiens | U1 snRNP | RNPU1Z, RPU1, SNRP70, Snp1, U1-70K | 51.6 | 4 |
| SNRPD3 | H. sapiens | Sm | SMD3, Sm-D3 | 13.9 | 4 |
| SRSF3 | H. sapiens | SR protein | SFRS3, SRp20 | 19.3 | 4 |
| NCBP2 | H. sapiens | pre-mRNA/mRNA binding proteins | CBC2, CBP20, NIP1, PIG55 | 18.0 | 4 |
| BUB3 | H. sapiens | | BUB3L, hBUB3 | 37.2 | 4 |
| RBM39 | H. sapiens | pre-mRNA/mRNA binding proteins | CAPER, CAPERalpha, DKFZp781C0423, FLJ44170, FSAP59 | 59.4 | 4 |
| ZNF207 | H. sapiens | other rna binding domain containing | DKFZp761N202 | 50.8 | 4 |
| DHX36 | H. sapiens | other rna binding domain containing | DDX36, G4R1, KIAA1488, MLEL1, RHAU | 114.8 | 4 |
| CHERP | H. sapiens | 17S U2 snRNP associated | DAN16, SCAF6, SRA1 | 103.7 | 3 |
| HNRNPR | H. sapiens | hnRNP | FLJ25714, HNRPR, hnRNP R, hnRNP-R | 70.9 | 3 |
| SYNCRIP | H. sapiens | hnRNP | FLJ31626, GRY-RBP, GRYRBP, HNRPQ1, NSAP1 | 69.6 | 3 |
| HNRNPC | H. sapiens | hnRNP | C1, C2, HNRNP, HNRPC, MGC104306 | 33.7 | 3 |
| HSPA8 | H. sapiens | PRP19 complex | HSC54, HSC70, HSC71, HSP71, HSP73 | 70.9 | 3 |
| DDX17 | H. sapiens | pre-mRNA/mRNA binding proteins | DKFZp761H2016, P72, RH70 | 80.3 | 3 |
| SNRPD1 | H. sapiens | Sm | HsT2456, SMD1, SNRPD, Sm-D1 | 13.3 | 3 |
| SNRPA1 | H. sapiens | 17S U2 snRNP | Lea1 | 28.4 | 3 |
| RUVBL1 | H. sapiens | misc. proteins found irregularly with spliceosomes | ECP54, INO80H, NMP238, PONTIN, Pontin52 | 50.2 | 2 |
| TTI1 | H. sapiens | | KIAA0406, smg-10 | 122.1 | 2 |
| FTSJD2 | H. sapiens | | FLJ22156, KIAA0082, MTr1, hMTr1 | 95.3 | 2 |
| DDX5 | H. sapiens | pre-mRNA/mRNA binding proteins | DKFZp434E109, DKFZp686J01190, G17P1, HLR1, HUMP68 | 69.1 | 2 |
| SUGP1 | H. sapiens | Recruited at A complex | DKFZp434E2216, F23858, RBP, SF4 | 72.5 | 2 |
| PFKM | H. sapiens | common MS contaminants | GSD7, MGC8699, PFK-1, PFK1, PFKA | 85.2 | 2 |
| SNRPB2 | H. sapiens | 17S U2 snRNP | MGC24807, MGC45309, Msl1 | 25.5 | 2 |
| HNRNPA2B1 | H. sapiens | hnRNP | DKFZp779B0244, FLJ22720, HNRNPA2, HNRNPB1, HNRPA2 | 37.4 | 2 |
| HNRNPA3 | H. sapiens | hnRNP | 2610510D13Rik, D10S102, FBRNP, HNRPA3, MGC138232 | 39.6 | 2 |
| SNRPD2 | H. sapiens | Sm | SMD2, SNRPD1, Sm-D2 | 13.5 | 2 |
| YBX1 | H. sapiens | pre-mRNA/mRNA binding proteins | BP-8, CSDA2, CSDB, DBPB, MDR-NF1 | 35.9 | 2 |
| U2SURP | H. sapiens | 17S U2 snRNP associated | KIAA0332, MGC133197, SR140, fSAPa | 118.3 | 2 |
| HNRNPA0 | H. sapiens | hnRNP | HNRPA0 | 30.8 | 2 |
| SF1 | H. sapiens | Recruited at A complex | BBP, D11S636, MBBP, ZFM1, ZNF162 | 68.3 | 2 |
| SNRPA | H. sapiens | U1 snRNP | Mud1, U1-A, U1A | 31.3 | 2 |
| TUBA4A | H. sapiens | common MS contaminants | FLJ30169, H2-ALPHA, TUBA1 | 49.9 | 2 |
| HNRNPK | H. sapiens | hnRNP | CSBP, FLJ41122, HNRPK, TUNP | 51.0 | 2 |
| SRSF11 | H. sapiens | SR protein | DKFZp686M13204, FLJ18226, NET2, SFRS11, dJ677H15.2 | 53.5 | 2 |
| LUC7L2 | H. sapiens | | CGI-59, CGI-74, FLJ10657, LUC7B2 | 46.5 | 2 |
| SF3A2 | H. sapiens | 17S U2 snRNP | PRP11, PRPF11, SAP62, SF3a66 | 49.3 | 2 |
| PHF5A | H. sapiens | 17S U2 snRNP | INI, MGC1346, Rds3, SAP14b, SF3b14b | 12.4 | 2 |