This gene encodes the gamma subunit of the 7S nerve growth factor (NGF) complex that is essential for the differentiation and survival of distinct populations of neurons in both the central and the peripheral nervous systems. The encoded protein is a glandular kallikrein-type serine protease that processes the beta subunit of NGF. This gene is present in a cluster of multiple related kallikrein-type protease genes on chromosome 7. [provided by RefSeq, Jul 2015]