SRS208963 SAMN00619345 4577 Zea mays B73 stock, 14-day-old seedlings SRS208964 SAMN00619346 4577 Zea mays Wild type maize seeds, B73 stock, were germinated in vermiculite at 30 C for three days and the last 2-3 mm of the primary root tips cut off with a razor blade and frozen on dry ice.