• Video 1 MT aster formation in crude interphase X. laevis egg extracts.
• Video 2 ER network formation in crude interphase X. laevis egg extracts.
• Video 3 ER tubule extension toward the minus end of MTs.
• Video 4 The leading ends of ER tubules track with the plus ends of MTs.
• Video 5 The ER network undergoes tubule-to-sheet conversion during the transition from interphase to mitosis.
• Video 6 Tubule-to-sheet conversion of the ER in a fractionated system.
• Video 7 Merging of ER sheets during the transition from interphase to mitosis.