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Signal peptide peptidase-like 2c (SPPL2c) is the only member of the GxGD type intramembrane-cleaving aspartyl proteases that so far has not been assigned any substrates and thus its capability of proteolysis and its physiological function remain enigmatic. Based on a surprisingly high expression of SPPL2c in elongated spermatids we applied proteomics on a cellular model system with ectopic expression of SPPL2c and identified a variety of candidate substrates. The majority of these candidate ...