Flower (Drosophila)

What it is. Cell-surface protein used in fly “cell competition” to mark less-fit cells.

Why it matters here. Illustrates neighborhood selection: winners eliminate losers. Mammalian analogs exist but are less defined.

Notes. Type: membrane protein; Concept: fitness tagging.

![[image-5.png|https://journals.lww.com/nrronline/fulltext/2023/04000/signaling_interactions_among_neurons_impact_cell.15.aspx]]

![[image-4.png|https://www.sciencedirect.com/science/article/pii/S1534580710002182]]