RESUMO
A major challenge in plant biology is to understand how the plant hormone auxin regulates diverse transcriptional responses throughout development, in different environments, and in different species. The answer may lie in the specific complement of auxin signaling components in each cell. The balance between activators (class-A AUXIN RESPONSE FACTORS) and repressors (class-B ARFs) is particularly important. It is unclear how this balance is achieved. Through comparative analysis of novel, dominant mutants in maize and the moss Physcomitrium patens , we have discovered a â¼500-million-year-old mechanism of class-B ARF protein level regulation, important in determining cell fate decisions across land plants. Thus, our results add a key piece to the puzzle of how auxin regulates plant development.
RESUMO
Coronavirus 2019 (COVID-19) is a viral disease first described in Wuhan, China, which has quickly emerged as a global pandemic with a myriad of manifestations including dermatologic (Li My et al., n.d.; Gottlieb and Long, 2020 [1,2]). A variety of cutaneous symptoms have presented throughout various stages of the disease (Marzano, 2020; Recalcati, n.d.; Henry et al., n.d.; Fernandez-Nieto et al., n.d.; Quintana-Castanedo et al., n.d. [3-5,7,8]). We describe a case of a female patient who presented with an Erythema Nodosum-like exanthema likely secondary to COVID-19. The patient described tested positive for COVID-19 three days prior to presentation for the rash with minimal other symptoms of COVID-19. Given the high infectivity rate as well as multisystem presentation, it is important to continue to report on novel presentations of the virus for early identification and treatment of complications.
