The inner mitochondrial membrane is compartmentalized into numerous cristae , which expand the surface area of the inner mitochondrial membrane, enhancing its ability to produce ATP. For typical liver mitochondria, the area of the inner membrane is about five times as large as the outer membrane. This ratio is variable and mitochondria from cells that have a greater demand for ATP, such as muscle cells, contain even more cristae. These folds are studded with small round bodies known as F 1 particles or oxysomes. These are not simple random folds but rather invaginations of the inner membrane, which can affect overall chemiosmotic function. 
There is one · special · · atomic · datatype ( anyAtomicType ), and a number of · primitive · · atomic · datatypes which have anyAtomicType as their · base type · . All other · atomic · datatypes are · derived · either from one of the · primitive · · atomic · datatypes or from another · ordinary · · atomic · datatype. No · user-defined · datatype may have anyAtomicType as its · base type · .