sma-2 notes

Deep research: the first wrapper runs reported a falcon timeout, and the perplexity fallback was unavailable. A falcon job still completed and wrote sma-2-deep-research-falcon.md, which was used together with the cached publications and UniProt Q02330.

Extra points from the deep-research report (not cached here, so not used as annotation evidence):
- Wang et al. 2005 (doi:10.1242/dev.01930): a phosphomimetic SMA-2 C-terminus rescues body length. Tagged SMA-2 fusions failed to rescue, so native SMA-2 localization is not imaged.
- Ciccarelli et al. 2024 (PLoS Genet): sma-2(e502) mutants survive worse on Photorhabdus luminescens. This is a possible future antibacterial-defense annotation; no NEW was added.
- In the Drechmeria antifungal response, SMA-3 acts without SMA-2 or SMA-4.

• SMA-2 is an R-Smad (dwarfin) of the DBL-1 Sma/Mab pathway PMID:8570636
• Core pathway: PMID:28549065
• No direct SMA-2/SMA-3 interaction in yeast two-hybrid PMID:28549065
• Minor role in tail tip retraction: it only enhances the sma-3 Lep phenotype PMID:21408209.
• Pharynx development (IMP) was changed to organ growth, because the pharynx is smaller but morphologically normal PMID:21868609.
• I-SMAD binding (IBA) is marked over-annotated. PTHR13703 has no C. elegans member in the SMAD6 (SF28) or SMAD7 (SF44) subfamilies (interpro/panther/PTHR13703/PTHR13703-entries.csv).