One embodiment of the present invention sets forth a technique for compositing a rendered path object into an image buffer. At least one document is recorded previously in the apparatus. The variable slip bushing also includes an outer wall slidably engaging the bore of the first structure for closing the gap as the fastener is tightened against the variable slip bushing to secure the first structure to the second structure. The controller incorporates digitally programmable delays into the processing paths for each of the high-side and low-side signals. The method can include measuring total urinary protein content, blood urea nitrogen or creatinine in a blood sample before, during or after the administration of an iron chelator. Also provided are vectors, host cells, antibodies, and recombinant methods for producing human secreted proteins.