The function of Ensembl gene identifier ENSG00000141384 (TAF4B, TATA-box binding protein associated factor 4b) is as follows. Cell type-specific subunit of the general transcription factor TFIID that may function as a gene-selective coactivator in certain cells. TFIID is a multimeric protein complex that plays a central role in mediating promoter responses to various activators and repressors. TAF4B is a transcriptional coactivator of the p65/RELA NF- kappa-B subunit. Involved in the activation of a subset of antiapoptotic genes including TNFAIP3. May be involved in regulating folliculogenesis. Through interaction with OCBA/POU2AF1, acts as a coactivator of B-cell-specific transcription. Plays a role in spermiogenesis and oogenesis. {ECO:0000250|UniProtKB:G5E8Z2, ECO:0000269|PubMed:10828057, ECO:0000269|PubMed:10849440, ECO:0000269|PubMed:16088961, ECO:0000303|PubMed:24431330}.