Abstract: A central lock comprises a center pole (2), a center top cap (1), and a center bottom cap (3). A locking piece (4) is received in the center bottom cap (3); a first through hole (41) is provided in the locking piece (4); and the end part of the center pole (2) is provided with a clamping groove (21) and a clamp locking part (22) located at the lower end of the clamping groove (21). When the central lock is in a locked state, the locking piece (4) is clamped with the clamping groove (21) of the center pole (2), and the locking part (22) abuts against a lower end surface of the locking piece (4); and when the central lock is in an unlocked state, the locking piece (4) is separated from the clamping groove (21), and the clamp locking part (22) can pass through the first through hole (41).

Abstract: A collapsible canopy frame with an improved locking mechanism. The collapsible canopy frame has at least three supporting legs. The collapsible canopy frame also has a central lock that is used for locking the collapsible canopy frame in an unfolded state and permits the collapsible canopy frame to be folded into a folded state when the central lock is unlocked. An outer retractable unit is connected between each adjacent supporting leg. An inner retractable unit having an inner end is connected between each supporting leg and the central lock. The inner end of the inner retractable unit is connected through the central lock.

Abstract: The present invention provides an intercellular protein delivery system comprising an engineered peptide (EP), composed of secretion part (SP) and nuclear translocation part (NTP), a functional or therapeutic protein (FP), cells that express the fusion proteins and cells that accept the fusion proteins. The system can be used in vivo or in vitro to sustainably supply proteins of interest for cellular reprogramming, cellular differentiation and cell-based protein therapies.