Structural constituent of cytoplasmic lattices, which plays a key role in early embryonic development (PubMed:37922900). Cytoplasmic lattices consist in fibrous structures found in the cytoplasm of oocytes and preimplantation embryos (PubMed:37922900). They are required to store maternal proteins critical for embryonic development, such as ribosomal proteins and proteins that control epigenetic reprogramming of the preimplantation embryo, and prevent their degradation or activation (PubMed:37922900). In contrast to other members of the family, does not show protein-arginine deiminase activity due to its inability to bind Ca(2+) (PubMed:38656308, PubMed:39286527). {ECO:0000269|PubMed:37922900, ECO:0000269|PubMed:38656308, ECO:0000269|PubMed:39286527}. This is the function of Ensembl gene identifier ENSG00000276747 (PADI6, peptidyl arginine deiminase 6).