A magnetic read head of either CIP or CPP configuration is disclosed having a read sensor having oxidized non-conductive regions. The plate assembly comprises first and second engaging members each defining an engaging edge. The likelihood of each observation vector representing an upper body component may be determined. The invention economizes on keystrokes and cursor actions, since the whole region of text desired to be highlighted does not have to be rebuilt every time a change is made. These novel fatty acid analogs are designed to enter the tissues of interest by the same long chain fatty acid carrier mechanism as natural fatty acids, however, functional substituents in the 2,3; 3,4; 4,5; 5,6 and other sequence positions, block the catabolic pathway, thus trapping these analogs in a virtually unmodified form in the tissues of interest. Preferably, the first channel accounts for at least about 70% of the total channel volume.