Original sentence: However, the interconnect (heartbeat) technology used with VCS is a proprietary Layer 2 ethernet-based protocol that is run in the kernel space using kernel modules
Edited sentence: However, the interconnect (heartbeat) technology used with VCS is a proprietary Layer 2 ethernet-based protocol that is run in the kernel space using kernel modules.. The group membership protocol that runs on top of the interconnect heartbeat protocol is also implemented in the kernel (same citation)