1. Definition of Groups for Alizarin Red Staining and Quantification.

group name	description
AF exp	cells cultured on aligned fiber scaffold expansion media
no-AF exp	cells cultured on nonaligned fiber scaffold in expansion media
AF ost diff	cells cultured on an aligned fiber scaffold in osteogenic media
no-AF ost diff	cells cultured on a nonaligned fiber scaffold in osteogenic media
control exp	cells cultured without a scaffold in expansion media
control ost diff	cells cultured without a scaffold in osteogenic media