{"version":"1.0","provider_name":"Harvard Gazette","provider_url":"https:\/\/news.harvard.edu\/gazette","author_name":"harvardgazette","author_url":"https:\/\/news.harvard.edu\/gazette\/story\/author\/harvardgazette\/","title":"Embryo\u2019s heartbeat drives blood stem cell formation &#8212; Harvard Gazette","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"G6UpVz7JvZ\"><a href=\"https:\/\/news.harvard.edu\/gazette\/story\/2009\/05\/embryos-heartbeat-drives-blood-stem-cell-formation\/\">Embryo\u2019s heartbeat drives blood stem cell formation<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/news.harvard.edu\/gazette\/story\/2009\/05\/embryos-heartbeat-drives-blood-stem-cell-formation\/embed\/#?secret=G6UpVz7JvZ\" width=\"600\" height=\"338\" title=\"&#8220;Embryo\u2019s heartbeat drives blood stem cell formation&#8221; &#8212; Harvard Gazette\" data-secret=\"G6UpVz7JvZ\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/news.harvard.edu\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"Biologists have long wondered why the embryonic heart begins beating so early, before the tissues actually need to be infused with blood. Two groups of Harvard Stem Cell Institute (HSCI) researchers from Children\u2019s Hospital Boston (Children\u2019s) and Brigham and Women\u2019s Hospital (BWH) \u2014 presenting multiple lines of evidence from zebrafish, mice, and mouse embryonic stem cells \u2014 provide an intriguing answer: A beating heart and blood flow are necessary for development of the blood system, which relies on mechanical stresses to cue its formation."}