gm, animal protein is just 0.01% better at building muscle mass than plant protein, according to a meta-analysis from 2021

for most people the source of protein doesn't matter for building and maintaining muscle mass

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7926405/

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The protein source does not matter but animal protein is more beneficial for building lean mass

yes, 0.01% more beneficial, according to the meta-analysis from 2021 that you commented under

I don’t see the 0.01% figure anywhere in the study. The abstract says there was a favouring effect in people < 50 years. Half a kg of gains attributed to it

read the "3.4. Results of Meta-Analysis", familiarize yourself with how to read such data (e.g. wmd, ci, etc)