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A Variable Grain Architecture (VGA) is used for synthesizing from primitive building elements (CBE's) an appropriate amount of dynamic multiplexing capability for each given task. Unused ones of such Configurable Building Elements (CBE's) are reconfigured to carry out further logic functions in plac

A Variable Grain Architecture (VGA) is used for synthesizing from primitive building elements (CBE's) an appropriate amount of dynamic multiplexing capability for each given task. Unused ones of such Configurable Building Elements (CBE's) are reconfigured to carry out further logic functions in place of the dynamic multiplexing functions. Each CBE may be programmably configured to provide no more than a 2-to-1 dynamic multiplexer (2:1 DyMUX). The dynamically-selectable output of such a synthesized 2:1 DyMUX may then be output onto a shared interconnect line. Pairs of CBE's may be synthetically combined to efficiently define 4:1 DyMUX's with each such 4:1 multiplexer occupying a Configurable Building Block (CBB) structure. Pairs of CBB's may be synthetically combined to efficiently define 8:1 DyMUX's with each such synthesized 8:1 multiplexer occupying a vertically or horizontally-extending leg portion of an L-shaped, VGB structure (Variable Grain Block). The so-configured leg portion of the VGB may then output the signal selected by its 8:1 DyMUX onto a shared interconnect line that is drivable by the VGB leg. Pairs or quartets of VGB's may be synthetically combined to efficiently define higher order, N:1 DyMUX's.

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A Variable Grain Architecture (VGA) is used for synthesizing from primitive building elements (CBE's) an appropriate amount of dynamic multiplexing capability for each given task. Unused ones of such Configurable Building Elements (CBE's) are reconfigured to carry out further logic functions in plac

A Variable Grain Architecture (VGA) is used for synthesizing from primitive building elements (CBE's) an appropriate amount of dynamic multiplexing capability for each given task. Unused ones of such Configurable Building Elements (CBE's) are reconfigured to carry out further logic functions in place of the dynamic multiplexing functions. Each CBE may be programmably configured to provide no more than a 2-to-1 dynamic multiplexer (2:1 DyMUX). The dynamically-selectable output of such a synthesized 2:1 DyMUX may then be output onto a shared interconnect line. Pairs of CBE's may be synthetically combined to efficiently define 4:1 DyMUX's with each such 4:1 multiplexer occupying a Configurable Building Block (CBB) structure. Pairs of CBB's may be synthetically combined to efficiently define 8:1 DyMUX's with each such synthesized 8:1 multiplexer occupying a vertically or horizontally-extending leg portion of an L-shaped, VGB structure (Variable Grain Block). The so-configured leg portion of the VGB may then output the signal selected by its 8:1 DyMUX onto a shared interconnect line that is drivable by the VGB leg. Pairs or quartets of VGB's may be synthetically combined to efficiently define higher order, N:1 DyMUX's. rein said polypeptide has at least 95% homology to the sequence depicted in SEQ ID NO:2. 13. A catalytically active deletion mutant of the polypeptide of claim 1, wherein the deletion mutant lacks at least one amino acid of said polypeptide, wherein said deletion mutant forms a monounsaturated bond between carbons 5 and 6 of a fatty acid as numbered from a caiboxy terminus thereof. 14. A catalytically active deletion mutant of the potypeptide of claim 2, wherein the deletion mutant lacks at least one amino acid of said polypeptide, wherein said deletion mutant forms a monounsaturated bond between carbons 5 and 6 of a fatty acid as numbered from a carboxy terminus thereof. 15. A catalytically active deletion mutant of the polypeptide of claim 7, wherein the deletion mutant lacks at least one amino acid of said polypeptide. 16. A catalytically active deletion mutant of the polypeptide of claim 8, wherein the deletion mutant lacks at least one amino acid of said polypeptide. 17. A catalytically active deletion mutant of the polypeptide of claim 9, wherein the deletion mutant lacks at least one amino acid of said polypeptide. 18. A catalytically active deletion mutant of the polypeptide of claim 10, wherein the deletion mutant lacks at least one amino acid of said polypeptide. 19. The polypeptide of claim 5 wherein said yeast cell is a Saccharomyces cell. 20. The polypeptide of claim 6 wherein said algae cell is a marine algae cell. 21. The polypeptide of claim 7 wherein the sequence of said polypeptide comprises a sequence selected from the group consisting of residues 30-38, 41-44, 171-175, 203-212 and 387-394 of SEQ ID NO:2. 22. The polyeptide of claim 10 wherein the sequence of said polypeptide comprises a sequence selected from the group consisting of residues 30-38, 41-44, 171-175, 203-212 and