Palmitoleic acid alkyne, an ω-terminal alkyne derivative of palmitoleic acid, facilitates click chemistry applications. This compound has played a crucial role in examining protein palmitoylation processes. Specifically, the cis form of palmitoleic acid alkyne selectively tags wild-type Wnt3a protein within mouse fibroblast L-cells expressing Wnt3a and its secretion in conditioned media, distinguishing itself from the trans form and proving ineffective against the S209A mutant Wnt3a.