Required for aerial hyphae formation (PubMed:12169618, PubMed:12100547, PubMed:12453210). Probably involved in processing the precursor of SapB to its mature form (Probable). Expressed in substrate hyphae and very immature aerial hyphae. Expression commences by 24 hours after germination, is maximal at 36 hours and has disappeared by 72 hours; expression is higher in wild-type strain J1501 versus M145 (at protein level). Requires bldD, cprA and ramR for expression, deletion of bldM or bldN increases accumulation of RamC (PubMed:12100547, PubMed:12453210). Probably part of the ramC-ramS-ramA-ramB operon (PubMed:12100547, PubMed:12453210). Transcribed from 23 to about 40 hours after germination, requires ramR for expression (PubMed:22486809). Deletion of ramC leads to loss of aerial hyphae and sporulation on rich or minimal solid medium after 4 days growth (PubMed:12169618, PubMed:12100547, PubMed:12453210). Deletion of the ramC-ramS-ramA-ramB operon on rich medium leads to an initially bald (no aerial hyphae) phenotype; after 4 days develops a substantial aerial mycelium. Wild-type mycelium on minimal medium. No expression of SapB, normal expression of chaplins. A complete chaplin-negative plus ram-negative strain (deletion of ramR or the ramC-ramS-ramA-ramB operon) leads to the complete loss of robust aerial hyphae (PubMed:17462011). In the N-terminal section; belongs to the protein kinase superfamily. It is uncertain whether Met-1 or Val-27 is the initiator.