Increases the platelet count associated with splenomegaly. May have an important role in neuronal precursor development and maturation. Binds to tripartite CNTF receptor complex consisting of CNTF alpha chain, LIFR and IL6ST (in vitro). Not detected in adult tissues. Expressed in embryonic life, with a dramatic peak at day 11 of gestation. At 10 dpc, it is prominently expressed in cells scattered throughout all neuroepithelia, it is also detectable in cranial and dorsal root sensory ganglia, and spinal cord. At 14 dpc, outside the nervous system, it is detectable in vibrissae, dermis, and to a lesser extent in skeletal muscle, lung, and kidney. Belongs to the IL-6 superfamily.