sentence: In addition , VIG1 associated , in at least 2 experiments , with putative mRNA splicing factors ( SART1 , squamous cell carcinoma antigen recognized by T cells 1 ; SRP23 , serine arginine rich-like protein 23 ) , several components of the protein translation machinery ( eIF3A , eukaryotic translation initiation factor 3 subunit A ; eIF3M , eukaryotic translation initiation factor 3 subunit M ; eIF4A , eukaryotic translation initiation factor 4 subunit A ; eS4 [ RPS4 ] , 40S ribosomal protein S4e ; eS7 [ RPS7 ] , 40S ribosomal protein S7e ; eL13 [ RPL13 ] , 60S ribosomal protein L13e ; uL13 [ RPL13A ] , 60S ribosomal protein L13A ) , a putative ATP-dependent RNA helicase ( HEL61 ) , and protein arginine N-methyltransferase 2 ( PRMT2 ) ( Fig. 3A and SI Appendix , Table S1 ) .