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The determination of Li and proton-capture element abundances in globularcluster (GC) giants allows us to constrain several key questions on themultiple population scenarios in GCs, from formation and early evolution, topollution and dilution mechanisms. In this Letter, we present our results on Liabundances for a large sample of giants in the intermediate-metallicity GC NGC6121 (M4), for which Na and O have been already determined by Marino et al. Thestars analyzed are both below and above the red giant branch bump luminosity.We found that the first and second generation stars share the same Li content,suggesting that a Li production must have occurred. This is a strongobservational evidence providing support for the scenario in which asymptoticgiant branch stars are GC polluters.

Lithium abundances in red giants of M4: evidence for asymptotic giant branch star pollution in globular clusters?