I am not a biologist, so please pardon the overly noob question. Some genes are TF and regulate other genes. My question is: if a gene is NOT a TF gene, can it regulate itself? E.g. given a system of 3 genes `{g1,g2,g3}` where only `g1` and `g2` are TF, then in a gene regulatory network, what are ALL possible parental sets of `g3` (where in this GRN, you put a directed edge from the regulating gene to the regulated gene)? Will it be `{{g1},{g1,g2},{g2},{}}` or `{{g3,g1},{g3,g1,g2},{g3,g2},{g3}}`