A slip knot is a releasable stopper knot. Neurotransmitters are stored in readily releasable pools of vesicles confined within the presynaptic terminal. Synaptic fatigue or depression is usually attributed to the depletion of the readily releasable vesicles. This is also called the readily releasable pool (RRP) of vesicles. The releasable pool is sometimes subdivided into the readily releasable pool and the releasable pool. The readily releasable pool is small and is quickly exhausted. Despite the abundance of releasable material, this album did not feature any B-side releases. The Sierra I class was also fitted with a releasable escape pod for the crew. The "increment" is the potentially releasable output of the sprint that meets the sprint goal. A FRAM is a Flight Releasable Attachment Mechanism. The creative differences resulted in no releasable recordings being produced.