invertase/pectin methylesterase inhibitor family protein. similar to invertase/pectin methylesterase inhibitor family protein [Arabidopsis thaliana] (TAIR:AT2G47050.1); similar to pollen development related protein [Brassica rapa subsp. chinensis] (GB:ABC25451.1); contains InterPro domain Pectinesterase inhibitor; (InterPro:IPR006501)