Potential Ras effector protein. May function as a guanine nucleotide exchange (GEF), by exchanging bound GDP for free GTP (By similarity). In late cellular blastoderm embryos, it is expressed in the posterior end. Then, as development proceeds, it is expressed in the developing midgut, amnioserosa and in a specific subset of CNS neurons. Isoform 1 is expressed earlier in developing midgut and amnioserosa, but is not expressed in the CNS. Expressed both maternally and zygotically. Belongs to the RIN (Ras interaction/interference) family. Truncated N-terminus.